diff --git a/src/backend/corebackenddevice.h b/src/backend/corebackenddevice.h
index cd8c835..116f46d 100644
--- a/src/backend/corebackenddevice.h
+++ b/src/backend/corebackenddevice.h
@@ -94,22 +94,21 @@ public:
     virtual bool createPartitionTable(Report& report, const PartitionTable& ptable) = 0;
 
     /**
-      * Read sectors from an opened device into a buffer.
+      * Read data from an opened device into a buffer.
       * @param buffer the buffer to write the read data to
-      * @param offset offset sector where to start reading on the device
-      * @param numSectors number of sectors to read
+      * @param offset offset byte where to start reading on the device
+      * @param size the number of bytes to read
       * @return true on success
       */
-    virtual bool readSectors(void* buffer, qint64 offset, qint64 numSectors) = 0;
+    virtual bool readData(QByteArray& buffer, qint64 offset, qint64 size) = 0;
 
     /**
-      * Write sectors from a buffer to an exclusively opened device.
+      * Write data from a buffer to an exclusively opened device.
       * @param buffer the buffer with the data
-      * @param offset offset sector where to start writing to the device
-      * @param numSectors number of sectors to write
+      * @param offset offset byte where to start writing to the device
       * @return true on success
       */
-    virtual bool writeSectors(void* buffer, qint64 offset, qint64 numSectors) = 0;
+    virtual bool writeData(QByteArray& buffer, qint64 offset) = 0;
 
 protected:
     void setExclusive(bool b) {
diff --git a/src/core/copysource.h b/src/core/copysource.h
index 2faa185..d1d9ae6 100644
--- a/src/core/copysource.h
+++ b/src/core/copysource.h
@@ -41,13 +41,12 @@ protected:
 
 public:
     virtual bool open() = 0;
-    virtual qint64 sectorSize() const = 0;
-    virtual bool readSectors(void* buffer, qint64 readOffset, qint64 numSectors) = 0;
+    virtual bool readData(QByteArray& buffer, qint64 readOffset, qint64 size) = 0;
     virtual qint64 length() const = 0;
     virtual bool overlaps(const CopyTarget& target) const = 0;
 
-    virtual qint64 firstSector() const = 0;
-    virtual qint64 lastSector() const = 0;
+    virtual qint64 firstByte() const = 0;
+    virtual qint64 lastByte() const = 0;
 
 private:
 };
diff --git a/src/core/copysourcedevice.cpp b/src/core/copysourcedevice.cpp
index cb41ccb..fff46ba 100644
--- a/src/core/copysourcedevice.cpp
+++ b/src/core/copysourcedevice.cpp
@@ -28,14 +28,14 @@
 
 /** Constructs a CopySource on the given Device
     @param d Device from which to copy
-    @param firstsector First sector that will be copied
-    @param lastsector Last sector that will be copied
+    @param firstbyte the first byte that will be copied
+    @param lastbyte the last byte that will be copied
 */
-CopySourceDevice::CopySourceDevice(Device& d, qint64 firstsector, qint64 lastsector) :
+CopySourceDevice::CopySourceDevice(Device& d, qint64 firstbyte, qint64 lastbyte) :
     CopySource(),
     m_Device(d),
-    m_FirstSector(firstsector),
-    m_LastSector(lastsector),
+    m_FirstByte(firstbyte),
+    m_LastByte(lastbyte),
     m_BackendDevice(nullptr)
 {
 }
@@ -55,36 +55,28 @@ bool CopySourceDevice::open()
     return m_BackendDevice != nullptr;
 }
 
-/** Returns the Device's sector size
-    @return the sector size
-*/
-qint64 CopySourceDevice::sectorSize() const
-{
-    return device().logicalSize();
-}
-
 /** Returns the length of this CopySource
     @return length of the copy source
 */
 qint64 CopySourceDevice::length() const
 {
-    return lastSector() - firstSector() + 1;
+    return lastByte() - firstByte() + 1;
 }
 
-/** Reads a given number of sectors from the Device into the given buffer.
+/** Reads a given number of bytes from the Device into the given buffer.
 
     Note that @p readOffset must be greater or equal than zero.
 
-    @param buffer the buffer to store the read sectors in
+    @param buffer the buffer to store the read bytes in
     @param readOffset the offset to begin reading
-    @param numSectors the number of sector to read
+    @param size the number of bytes to read
 
     @return true if successful
 */
-bool CopySourceDevice::readSectors(void* buffer, qint64 readOffset, qint64 numSectors)
+bool CopySourceDevice::readData(QByteArray& buffer, qint64 readOffset, qint64 size)
 {
     Q_ASSERT(readOffset >= 0);
-    return m_BackendDevice->readSectors(buffer, readOffset, numSectors);
+    return m_BackendDevice->readData(buffer, readOffset, size);
 }
 
 /** Checks if this CopySourceDevice overlaps with the given CopyTarget
@@ -100,11 +92,11 @@ bool CopySourceDevice::overlaps(const CopyTarget& target) const
             return false;
 
         // overlapping at the front?
-        if (firstSector() <= t.firstSector() && lastSector() >= t.firstSector())
+        if (firstByte() <= t.firstByte() && lastByte() >= t.firstByte())
             return true;
 
         // overlapping at the back?
-        if (firstSector() <= t.lastSector() && lastSector() >= t.lastSector())
+        if (firstByte() <= t.lastByte() && lastByte() >= t.lastByte())
             return true;
     } catch (...) {
     }
diff --git a/src/core/copysourcedevice.h b/src/core/copysourcedevice.h
index 2352140..ad1be9b 100644
--- a/src/core/copysourcedevice.h
+++ b/src/core/copysourcedevice.h
@@ -39,21 +39,20 @@ class LIBKPMCORE_EXPORT CopySourceDevice : public CopySource
     Q_DISABLE_COPY(CopySourceDevice)
 
 public:
-    CopySourceDevice(Device& d, qint64 firstsector, qint64 lastsector);
+    CopySourceDevice(Device& d, qint64 firstbyte, qint64 lastbyte);
     ~CopySourceDevice();
 
 public:
     bool open() override;
-    qint64 sectorSize() const override;
-    bool readSectors(void* buffer, qint64 readOffset, qint64 numSectors) override;
+    bool readData(QByteArray& buffer, qint64 readOffset, qint64 size) override;
     qint64 length() const override;
     bool overlaps(const CopyTarget& target) const override;
 
-    qint64 firstSector() const override {
-        return m_FirstSector;    /**< @return first sector to copying */
+    qint64 firstByte() const override {
+        return m_FirstByte;    /**< @return first byte to copy */
     }
-    qint64 lastSector() const override {
-        return m_LastSector;    /**< @return last sector to copy */
+    qint64 lastByte() const override {
+        return m_LastByte;    /**< @return last byte to copy */
     }
 
     Device& device() {
@@ -65,8 +64,8 @@ public:
 
 protected:
     Device& m_Device;
-    const qint64 m_FirstSector;
-    const qint64 m_LastSector;
+    const qint64 m_FirstByte;
+    const qint64 m_LastByte;
     CoreBackendDevice* m_BackendDevice
     ;
 };
diff --git a/src/core/copysourcefile.cpp b/src/core/copysourcefile.cpp
index d8ceff4..936aec0 100644
--- a/src/core/copysourcefile.cpp
+++ b/src/core/copysourcefile.cpp
@@ -23,12 +23,10 @@
 
 /** Constructs a CopySourceFile from the given @p filename.
     @param filename filename of the file to copy from
-    @param sectorsize the sector size to assume for the file, usually the target Device's sector size
 */
-CopySourceFile::CopySourceFile(const QString& filename, qint64 sectorsize) :
+CopySourceFile::CopySourceFile(const QString& filename) :
     CopySource(),
-    m_File(filename),
-    m_SectorSize(sectorsize)
+    m_File(filename)
 {
 }
 
@@ -40,24 +38,25 @@ bool CopySourceFile::open()
     return file().open(QIODevice::ReadOnly);
 }
 
-/** Returns the length of the file in sectors.
-    @return length of the file in sectors.
+/** Returns the length of the file in bytes.
+    @return length of the file in bytes.
 */
 qint64 CopySourceFile::length() const
 {
-    return QFileInfo(file()).size() / sectorSize();
+    return QFileInfo(file()).size();
 }
 
-/** Reads the given number of sectors from the file into the given buffer.
-    @param buffer buffer to store the sectors read in
+/** Reads the given number of bytes from the file into the given buffer.
+    @param buffer buffer to store the bytes read in
     @param readOffset offset where to begin reading
-    @param numSectors number of sectors to read
+    @param size the number of bytes to read
     @return true on success
 */
-bool CopySourceFile::readSectors(void* buffer, qint64 readOffset, qint64 numSectors)
+bool CopySourceFile::readData(QByteArray& buffer, qint64 readOffset, qint64 size)
 {
-    if (!file().seek(readOffset * sectorSize()))
+    if (!file().seek(readOffset))
         return false;
 
-    return file().read(static_cast<char*>(buffer), numSectors * sectorSize()) == numSectors * sectorSize();
+    buffer = file().read(size);
+    return !buffer.isEmpty();
 }
diff --git a/src/core/copysourcefile.h b/src/core/copysourcefile.h
index 5baf7d9..bad5894 100644
--- a/src/core/copysourcefile.h
+++ b/src/core/copysourcefile.h
@@ -36,23 +36,20 @@ class CopyTarget;
 class CopySourceFile : public CopySource
 {
 public:
-    CopySourceFile(const QString& filename, qint64 sectorsize);
+    CopySourceFile(const QString& filename);
 
 public:
     bool open() override;
-    bool readSectors(void* buffer, qint64 readOffset, qint64 numSectors) override;
+    bool readData(QByteArray& buffer, qint64 readOffset, qint64 size) override;
     qint64 length() const override;
 
-    qint64 sectorSize() const override {
-        return m_SectorSize;    /**< @return the file's sector size */
-    }
     bool overlaps(const CopyTarget&) const override {
         return false;    /**< @return false for file */
     }
-    qint64 firstSector() const override {
+    qint64 firstByte() const override {
         return 0;    /**< @return 0 for file */
     }
-    qint64 lastSector() const override {
+    qint64 lastByte() const override {
         return length();    /**< @return equal to length for file. @see length() */
     }
 
@@ -66,7 +63,6 @@ protected:
 
 protected:
     QFile m_File;
-    qint64 m_SectorSize;
 };
 
 #endif
diff --git a/src/core/copysourceshred.cpp b/src/core/copysourceshred.cpp
index 1672f4c..b8d708e 100644
--- a/src/core/copysourceshred.cpp
+++ b/src/core/copysourceshred.cpp
@@ -20,12 +20,10 @@
 
 /** Constructs a CopySourceShred with the given @p size
     @param s the size the copy source will (pretend to) have
-    @param sectorsize the sectorsize the copy source will (pretend to) have
 */
-CopySourceShred::CopySourceShred(qint64 s, qint64 sectorsize, bool randomShred) :
+CopySourceShred::CopySourceShred(qint64 s, bool randomShred) :
     CopySource(),
     m_Size(s),
-    m_SectorSize(sectorsize),
     m_SourceFile(randomShred ? QStringLiteral("/dev/urandom") : QStringLiteral("/dev/zero"))
 {
 }
@@ -38,23 +36,24 @@ bool CopySourceShred::open()
     return sourceFile().open(QIODevice::ReadOnly);
 }
 
-/** Returns the length of the source in sectors.
-    @return length of the source in sectors.
+/** Returns the length of the source in bytes.
+    @return length of the source in bytes.
 */
 qint64 CopySourceShred::length() const
 {
-    return size() / sectorSize();
+    return size();
 }
 
-/** Reads the given number of sectors from the source into the given buffer.
-    @param buffer buffer to store the sectors read in
+/** Reads the given number of bytes from the source into the given buffer.
+    @param buffer buffer to store the data read in
     @param readOffset offset where to begin reading (unused)
-    @param numSectors number of sectors to read
+    @param size the number of bytes to read
     @return true on success
 */
-bool CopySourceShred::readSectors(void* buffer, qint64 readOffset, qint64 numSectors)
+bool CopySourceShred::readData(QByteArray& buffer, qint64 readOffset, qint64 size)
 {
     Q_UNUSED(readOffset);
 
-    return sourceFile().read(static_cast<char*>(buffer), numSectors * sectorSize()) == numSectors * sectorSize();
+    buffer = sourceFile().read(size);
+    return !buffer.isEmpty();
 }
diff --git a/src/core/copysourceshred.h b/src/core/copysourceshred.h
index e22f21d..df83366 100644
--- a/src/core/copysourceshred.h
+++ b/src/core/copysourceshred.h
@@ -34,23 +34,20 @@ class CopyTarget;
 class CopySourceShred : public CopySource
 {
 public:
-    CopySourceShred(qint64 size, qint64 sectorsize, bool randomShred);
+    CopySourceShred(qint64 size, bool randomShred);
 
 public:
     bool open() override;
-    bool readSectors(void* buffer, qint64 readOffset, qint64 numSectors) override;
+    bool readData(QByteArray& buffer, qint64 readOffset, qint64 size) override;
     qint64 length() const override;
 
-    qint64 sectorSize() const override {
-        return m_SectorSize;    /**< @return the file's sector size */
-    }
     bool overlaps(const CopyTarget&) const override {
         return false;    /**< @return false for shred source */
     }
-    qint64 firstSector() const override {
+    qint64 firstByte() const override {
         return 0;    /**< @return 0 for shred source */
     }
-    qint64 lastSector() const override {
+    qint64 lastByte() const override {
         return length();    /**< @return equal to length for shred source. @see length() */
     }
 
@@ -67,7 +64,6 @@ protected:
 
 private:
     qint64 m_Size;
-    qint64 m_SectorSize;
     QFile m_SourceFile;
 };
 
diff --git a/src/core/copytarget.h b/src/core/copytarget.h
index 0847bff..e68d715 100644
--- a/src/core/copytarget.h
+++ b/src/core/copytarget.h
@@ -35,27 +35,26 @@ class CopyTarget
     Q_DISABLE_COPY(CopyTarget)
 
 protected:
-    CopyTarget() : m_SectorsWritten(0) {}
+    CopyTarget() : m_BytesWritten(0) {}
     virtual ~CopyTarget() {}
 
 public:
     virtual bool open() = 0;
-    virtual qint64 sectorSize() const = 0;
-    virtual bool writeSectors(void* buffer, qint64 writeOffset, qint64 numSectors) = 0;
-    virtual qint64 firstSector() const = 0;
-    virtual qint64 lastSector() const = 0;
+    virtual bool writeData(QByteArray& buffer, qint64 writeOffset) = 0;
+    virtual qint64 firstByte() const = 0;
+    virtual qint64 lastByte() const = 0;
 
-    qint64 sectorsWritten() const {
-        return m_SectorsWritten;
+    qint64 bytesWritten() const {
+        return m_BytesWritten;
     }
 
 protected:
-    void setSectorsWritten(qint64 s) {
-        m_SectorsWritten = s;
+    void setBytesWritten(qint64 s) {
+        m_BytesWritten = s;
     }
 
 private:
-    qint64 m_SectorsWritten;
+    qint64 m_BytesWritten;
 };
 
 #endif
diff --git a/src/core/copytargetdevice.cpp b/src/core/copytargetdevice.cpp
index 1ca1b38..c6c5c18 100644
--- a/src/core/copytargetdevice.cpp
+++ b/src/core/copytargetdevice.cpp
@@ -26,15 +26,15 @@
 
 /** Constructs a device to copy to.
     @param d the Device to copy to
-    @param firstsector the first sector on the Device to write to
-    @param lastsector the last sector on the Device to write to
+    @param firstbyte the first byte on the Device to write to
+    @param lastbyte the last byte on the Device to write to
 */
-CopyTargetDevice::CopyTargetDevice(Device& d, qint64 firstsector, qint64 lastsector) :
+CopyTargetDevice::CopyTargetDevice(Device& d, qint64 firstbyte, qint64 lastbyte) :
     CopyTarget(),
     m_Device(d),
     m_BackendDevice(nullptr),
-    m_FirstSector(firstsector),
-    m_LastSector(lastsector)
+    m_FirstByte(firstbyte),
+    m_LastByte(lastbyte)
 {
 }
 
@@ -53,28 +53,21 @@ bool CopyTargetDevice::open()
     return m_BackendDevice != nullptr;
 }
 
-/** @return the Device's sector size */
-qint64 CopyTargetDevice::sectorSize() const
-{
-    return device().logicalSize();
-}
-
-/** Writes the given number of sectors to the Device.
+/** Writes the given number of bytes to the Device.
 
     Note that @p writeOffset must be greater or equal than zero.
 
     @param buffer the data to write
     @param writeOffset where to start writing on the Device
-    @param numSectors the number of sectors in @p buffer
     @return true on success
 */
-bool CopyTargetDevice::writeSectors(void* buffer, qint64 writeOffset, qint64 numSectors)
+bool CopyTargetDevice::writeData(QByteArray& buffer, qint64 writeOffset)
 {
     Q_ASSERT(writeOffset >= 0);
-    bool rval = m_BackendDevice->writeSectors(buffer, writeOffset, numSectors);
+    bool rval = m_BackendDevice->writeData(buffer, writeOffset);
 
     if (rval)
-        setSectorsWritten(sectorsWritten() + numSectors);
+        setBytesWritten(bytesWritten() + buffer.size());
 
     return rval;
 }
diff --git a/src/core/copytargetdevice.h b/src/core/copytargetdevice.h
index c39cb04..3dd94d7 100644
--- a/src/core/copytargetdevice.h
+++ b/src/core/copytargetdevice.h
@@ -41,18 +41,17 @@ class LIBKPMCORE_EXPORT CopyTargetDevice : public CopyTarget
     Q_DISABLE_COPY(CopyTargetDevice)
 
 public:
-    CopyTargetDevice(Device& d, qint64 firstsector, qint64 lastsector);
+    CopyTargetDevice(Device& d, qint64 firstbyte, qint64 lastbyte);
     ~CopyTargetDevice();
 
 public:
     bool open() override;
-    qint64 sectorSize() const override;
-    bool writeSectors(void* buffer, qint64 writeOffset, qint64 numSectors) override;
-    qint64 firstSector() const override {
-        return m_FirstSector;    /**< @return the first sector to write to */
+    bool writeData(QByteArray& buffer, qint64 writeOffset) override;
+    qint64 firstByte() const override {
+        return m_FirstByte;    /**< @return the first byte to write to */
     }
-    qint64 lastSector() const override {
-        return m_LastSector;    /**< @return the last sector to write to */
+    qint64 lastByte() const override {
+        return m_LastByte;    /**< @return the last byte to write to */
     }
 
     Device& device() {
@@ -65,8 +64,8 @@ public:
 protected:
     Device& m_Device;
     CoreBackendDevice* m_BackendDevice;
-    const qint64 m_FirstSector;
-    const qint64 m_LastSector;
+    const qint64 m_FirstByte;
+    const qint64 m_LastByte;
 };
 
 #endif
diff --git a/src/core/copytargetfile.cpp b/src/core/copytargetfile.cpp
index 1b016e3..508f9b2 100644
--- a/src/core/copytargetfile.cpp
+++ b/src/core/copytargetfile.cpp
@@ -19,12 +19,10 @@
 
 /** Constructs a file to write to.
     @param filename name of the file to write to
-    @param sectorsize the "sector size" of the file to write to, usually the sector size of the CopySourceDevice
 */
-CopyTargetFile::CopyTargetFile(const QString& filename, qint64 sectorsize) :
+CopyTargetFile::CopyTargetFile(const QString& filename) :
     CopyTarget(),
-    m_File(filename),
-    m_SectorSize(sectorsize)
+    m_File(filename)
 {
 }
 
@@ -36,21 +34,20 @@ bool CopyTargetFile::open()
     return file().open(QIODevice::WriteOnly | QIODevice::Truncate);
 }
 
-/** Writes the given number of sectors from the given buffer to the file.
+/** Writes the given number of bytes from the given buffer to the file.
     @param buffer the data to write
     @param writeOffset where in the file to start writing
-    @param numSectors the number of sectors to write
     @return true on success
 */
-bool CopyTargetFile::writeSectors(void* buffer, qint64 writeOffset, qint64 numSectors)
+bool CopyTargetFile::writeData(QByteArray& buffer, qint64 writeOffset)
 {
-    if (!file().seek(writeOffset * sectorSize()))
+    if (!file().seek(writeOffset))
         return false;
 
-    bool rval = file().write(static_cast<char*>(buffer), numSectors * sectorSize()) == numSectors * sectorSize();
+    bool rval = file().write(buffer) == buffer.size();
 
     if (rval)
-        setSectorsWritten(sectorsWritten() + numSectors);
+        setBytesWritten(bytesWritten() + buffer.size());
 
     return rval;
 }
diff --git a/src/core/copytargetfile.h b/src/core/copytargetfile.h
index e2b0f1b..3e3ef3e 100644
--- a/src/core/copytargetfile.h
+++ b/src/core/copytargetfile.h
@@ -36,20 +36,17 @@ class QString;
 class CopyTargetFile : public CopyTarget
 {
 public:
-    CopyTargetFile(const QString& filename, qint64 sectorsize);
+    CopyTargetFile(const QString& filename);
 
 public:
     bool open() override;
-    bool writeSectors(void* buffer, qint64 writeOffset, qint64 numSectors) override;
+    bool writeData(QByteArray& buffer, qint64 writeOffset) override;
 
-    qint64 sectorSize() const override {
-        return m_SectorSize;    /**< @return the file's sector size */
-    }
-    qint64 firstSector() const override {
+    qint64 firstByte() const override {
         return 0;    /**< @return always 0 for a file */
     }
-    qint64 lastSector() const override {
-        return sectorsWritten();    /**< @return the number of sectors written so far */
+    qint64 lastByte() const override {
+        return bytesWritten();    /**< @return the number of bytes written so far */
     }
 
 protected:
@@ -62,7 +59,6 @@ protected:
 
 protected:
     QFile m_File;
-    qint64 m_SectorSize;
 };
 
 #endif
diff --git a/src/core/partition.h b/src/core/partition.h
index 155bfd8..91edd3f 100644
--- a/src/core/partition.h
+++ b/src/core/partition.h
@@ -131,6 +131,12 @@ public:
     qint64 lastSector() const {
         return m_LastSector;    /**< @return the Partition's last sector on the Device */
     }
+    qint64 firstByte() const {
+        return firstSector() * sectorSize();    /**< @return the Partition's first byte on the Device */
+    }
+    qint64 lastByte() const {
+        return firstByte() + length() * sectorSize() - 1;    /**< @return the Partition's last byte on the Device */
+    }
     qint64 sectorsUsed() const;
     qint64 sectorSize() const {
         return m_SectorSize;    /**< @return the sector size on the Partition's Device */
diff --git a/src/fs/filesystem.h b/src/fs/filesystem.h
index 636fb94..b4a7d0e 100644
--- a/src/fs/filesystem.h
+++ b/src/fs/filesystem.h
@@ -235,6 +235,12 @@ public:
     qint64 length() const {
         return lastSector() - firstSector() + 1;    /**< @return the FileSystem's length */
     }
+    qint64 firstByte() const {
+        return firstSector() * sectorSize();    /**< @return the FileSystem's first byte */
+    }
+    qint64 lastByte() const {
+        return firstByte() + length() * sectorSize() - 1;    /**< @return the FileSystem's last byte */
+    }
 
     void setFirstSector(qint64 s) {
         m_FirstSector = s;    /**< @param s the new first sector */
diff --git a/src/jobs/backupfilesystemjob.cpp b/src/jobs/backupfilesystemjob.cpp
index 9d84f84..bf72e2f 100644
--- a/src/jobs/backupfilesystemjob.cpp
+++ b/src/jobs/backupfilesystemjob.cpp
@@ -56,8 +56,8 @@ bool BackupFileSystemJob::run(Report& parent)
     if (sourcePartition().fileSystem().supportBackup() == FileSystem::cmdSupportFileSystem)
         rval = sourcePartition().fileSystem().backup(*report, sourceDevice(), sourcePartition().deviceNode(), fileName());
     else if (sourcePartition().fileSystem().supportBackup() == FileSystem::cmdSupportCore) {
-        CopySourceDevice copySource(sourceDevice(), sourcePartition().fileSystem().firstSector(), sourcePartition().fileSystem().lastSector());
-        CopyTargetFile copyTarget(fileName(), sourceDevice().logicalSize());
+        CopySourceDevice copySource(sourceDevice(), sourcePartition().fileSystem().firstByte(), sourcePartition().fileSystem().lastByte());
+        CopyTargetFile copyTarget(fileName());
 
         if (!copySource.open())
             report->line() << xi18nc("@info:progress", "Could not open file system on source partition <filename>%1</filename> for backup.", sourcePartition().deviceNode());
diff --git a/src/jobs/copyfilesystemjob.cpp b/src/jobs/copyfilesystemjob.cpp
index 2c028f9..b7ea5d6 100644
--- a/src/jobs/copyfilesystemjob.cpp
+++ b/src/jobs/copyfilesystemjob.cpp
@@ -60,8 +60,8 @@ bool CopyFileSystemJob::run(Report& parent)
     else if (sourcePartition().fileSystem().supportCopy() == FileSystem::cmdSupportFileSystem)
         rval = sourcePartition().fileSystem().copy(*report, targetPartition().deviceNode(), sourcePartition().deviceNode());
     else if (sourcePartition().fileSystem().supportCopy() == FileSystem::cmdSupportCore) {
-        CopySourceDevice copySource(sourceDevice(), sourcePartition().fileSystem().firstSector(), sourcePartition().fileSystem().lastSector());
-        CopyTargetDevice copyTarget(targetDevice(), targetPartition().fileSystem().firstSector(), targetPartition().fileSystem().lastSector());
+        CopySourceDevice copySource(sourceDevice(), sourcePartition().fileSystem().firstByte(), sourcePartition().fileSystem().lastByte());
+        CopyTargetDevice copyTarget(targetDevice(), targetPartition().fileSystem().firstByte(), targetPartition().fileSystem().lastByte());
 
         if (!copySource.open())
             report->line() << xi18nc("@info:progress", "Could not open file system on source partition <filename>%1</filename> for copying.", sourcePartition().deviceNode());
diff --git a/src/jobs/job.cpp b/src/jobs/job.cpp
index 75b68a1..26f0318 100644
--- a/src/jobs/job.cpp
+++ b/src/jobs/job.cpp
@@ -26,7 +26,6 @@
 
 #include "util/report.h"
 
-#include <QDebug>
 #include <QIcon>
 #include <QTime>
 
@@ -39,78 +38,68 @@ Job::Job() :
 
 bool Job::copyBlocks(Report& report, CopyTarget& target, CopySource& source)
 {
-    /** @todo copyBlocks() assumes that source.sectorSize() == target.sectorSize(). */
-
-    if (source.sectorSize() != target.sectorSize()) {
-        report.line() << xi18nc("@info:progress", "The logical sector sizes in the source and target for copying are not the same. This is currently unsupported.");
-        return false;
-    }
-
     bool rval = true;
-    const qint64 blockSize = 16065 * 8; // number of sectors per block to copy
+    const qint64 blockSize = 10 * 1024 * 1024; // number of bytes per block to copy
     const qint64 blocksToCopy = source.length() / blockSize;
 
-    qint64 readOffset = source.firstSector();
-    qint64 writeOffset = target.firstSector();
-    qint32 copyDir = 1;
+    qint64 readOffset = source.firstByte();
+    qint64 writeOffset = target.firstByte();
+    qint32 copyDirection = 1;
 
-    if (target.firstSector() > source.firstSector()) {
-        readOffset = source.firstSector() + source.length() - blockSize;
-        writeOffset = target.firstSector() + source.length() - blockSize;
-        copyDir = -1;
+    if (target.firstByte() > source.firstByte()) {
+        readOffset = source.firstByte() + source.length() - blockSize;
+        writeOffset = target.firstByte() + source.length() - blockSize;
+        copyDirection = -1;
     }
 
-    report.line() << xi18nc("@info:progress", "Copying %1 blocks (%2 sectors) from %3 to %4, direction: %5.", blocksToCopy, source.length(), readOffset, writeOffset, copyDir);
+    report.line() << xi18nc("@info:progress", "Copying %1 blocks (%2 bytes) from %3 to %4, direction: %5.", blocksToCopy, source.length(), readOffset, writeOffset, copyDirection);
 
     qint64 blocksCopied = 0;
 
-    void* buffer = malloc(blockSize * source.sectorSize());
+    QByteArray buffer;
     int percent = 0;
     QTime t;
     t.start();
-
     while (blocksCopied < blocksToCopy) {
-        if (!(rval = source.readSectors(buffer, readOffset + blockSize * blocksCopied * copyDir, blockSize)))
+        if (!(rval = source.readData(buffer, readOffset + blockSize * blocksCopied * copyDirection, blockSize)))
             break;
 
-        if (!(rval = target.writeSectors(buffer, writeOffset + blockSize * blocksCopied * copyDir, blockSize)))
+        if (!(rval = target.writeData(buffer, writeOffset + blockSize * blocksCopied * copyDirection)))
             break;
 
         if (++blocksCopied * 100 / blocksToCopy != percent) {
             percent = blocksCopied * 100 / blocksToCopy;
 
             if (percent % 5 == 0 && t.elapsed() > 1000) {
-                const qint64 mibsPerSec = (blocksCopied * blockSize * source.sectorSize() / 1024 / 1024) / (t.elapsed() / 1000);
+                const qint64 mibsPerSec = (blocksCopied * blockSize / 1024 / 1024) / (t.elapsed() / 1000);
                 const qint64 estSecsLeft = (100 - percent) * t.elapsed() / percent / 1000;
                 report.line() << xi18nc("@info:progress", "Copying %1 MiB/second, estimated time left: %2", mibsPerSec, QTime(0, 0).addSecs(estSecsLeft).toString());
             }
             emit progress(percent);
         }
     }
-
     const qint64 lastBlock = source.length() % blockSize;
 
     // copy the remainder
     if (rval && lastBlock > 0) {
         Q_ASSERT(lastBlock < blockSize);
 
-        const qint64 lastBlockReadOffset = copyDir > 0 ? readOffset + blockSize * blocksCopied : source.firstSector();
-        const qint64 lastBlockWriteOffset = copyDir > 0 ? writeOffset + blockSize * blocksCopied : target.firstSector();
+        const qint64 lastBlockReadOffset = copyDirection > 0 ? readOffset + blockSize * blocksCopied : source.firstByte();
+        const qint64 lastBlockWriteOffset = copyDirection > 0 ? writeOffset + blockSize * blocksCopied : target.firstByte();
 
         report.line() << xi18nc("@info:progress", "Copying remainder of block size %1 from %2 to %3.", lastBlock, lastBlockReadOffset, lastBlockWriteOffset);
 
-        rval = source.readSectors(buffer, lastBlockReadOffset, lastBlock);
+        rval = source.readData(buffer, lastBlockReadOffset, lastBlock);
 
         if (rval)
-            rval = target.writeSectors(buffer, lastBlockWriteOffset, lastBlock);
+            rval = target.writeData(buffer, lastBlockWriteOffset);
 
         if (rval)
             emit progress(100);
     }
 
-    free(buffer);
 
-    report.line() << xi18ncp("@info:progress argument 2 is a string such as 7 sectors (localized accordingly)", "Copying 1 block (%2) finished.", "Copying %1 blocks (%2) finished.", blocksCopied, i18np("1 sector", "%1 sectors", target.sectorsWritten()));
+    report.line() << xi18ncp("@info:progress argument 2 is a string such as 7 bytes (localized accordingly)", "Copying 1 block (%2) finished.", "Copying %1 blocks (%2) finished.", blocksCopied, i18np("1 byte", "%1 bytes", target.bytesWritten()));
 
     return rval;
 }
@@ -127,31 +116,31 @@ bool Job::rollbackCopyBlocks(Report& report, CopyTarget& origTarget, CopySource&
         CopyTargetDevice& ctd = dynamic_cast<CopyTargetDevice&>(origTarget);
 
         // default: use values as if we were copying from front to back.
-        qint64 undoSourceFirstSector = origTarget.firstSector();
-        qint64 undoSourceLastSector = origTarget.firstSector() + origTarget.sectorsWritten() - 1;
+        qint64 undoSourceFirstByte = origTarget.firstByte();
+        qint64 undoSourceLastByte = origTarget.firstByte() + origTarget.bytesWritten() - 1;
 
-        qint64 undoTargetFirstSector = origSource.firstSector();
-        qint64 undoTargetLastSector = origSource.firstSector() + origTarget.sectorsWritten() - 1;
+        qint64 undoTargetFirstByte = origSource.firstByte();
+        qint64 undoTargetLastByte = origSource.firstByte() + origTarget.bytesWritten() - 1;
 
-        if (origTarget.firstSector() > origSource.firstSector()) {
+        if (origTarget.firstByte() > origSource.firstByte()) {
             // we were copying from back to front
-            undoSourceFirstSector = origTarget.firstSector() + origSource.length() - origTarget.sectorsWritten();
-            undoSourceLastSector = origTarget.firstSector() + origSource.length() - 1;
+            undoSourceFirstByte = origTarget.firstByte() + origSource.length() - origTarget.bytesWritten();
+            undoSourceLastByte = origTarget.firstByte() + origSource.length() - 1;
 
-            undoTargetFirstSector = origSource.lastSector() - origTarget.sectorsWritten() + 1;
-            undoTargetLastSector = origSource.lastSector();
+            undoTargetFirstByte = origSource.lastByte() - origTarget.bytesWritten() + 1;
+            undoTargetLastByte = origSource.lastByte();
         }
 
-        report.line() << xi18nc("@info:progress", "Rollback from: First sector: %1, last sector: %2.", undoSourceFirstSector, undoSourceLastSector);
-        report.line() << xi18nc("@info:progress", "Rollback to: First sector: %1, last sector: %2.", undoTargetFirstSector, undoTargetLastSector);
+        report.line() << xi18nc("@info:progress", "Rollback from: First byte: %1, last byte: %2.", undoSourceFirstByte, undoSourceLastByte);
+        report.line() << xi18nc("@info:progress", "Rollback to: First byte: %1, last byte: %2.", undoTargetFirstByte, undoTargetLastByte);
 
-        CopySourceDevice undoSource(ctd.device(), undoSourceFirstSector, undoSourceLastSector);
+        CopySourceDevice undoSource(ctd.device(), undoSourceFirstByte, undoSourceLastByte);
         if (!undoSource.open()) {
             report.line() << xi18nc("@info:progress", "Could not open device <filename>%1</filename> to rollback copying.", ctd.device().deviceNode());
             return false;
         }
 
-        CopyTargetDevice undoTarget(csd.device(), undoTargetFirstSector, undoTargetLastSector);
+        CopyTargetDevice undoTarget(csd.device(), undoTargetFirstByte, undoTargetLastByte);
         if (!undoTarget.open()) {
             report.line() << xi18nc("@info:progress", "Could not open device <filename>%1</filename> to rollback copying.", csd.device().deviceNode());
             return false;
diff --git a/src/jobs/movefilesystemjob.cpp b/src/jobs/movefilesystemjob.cpp
index 5cd50f4..33c4e1a 100644
--- a/src/jobs/movefilesystemjob.cpp
+++ b/src/jobs/movefilesystemjob.cpp
@@ -55,8 +55,9 @@ bool MoveFileSystemJob::run(Report& parent)
     // say we're finished: The CopyTargetDevice dtor asks the backend to close the device
     // and that may take a while.
     {
-        CopySourceDevice moveSource(device(), partition().fileSystem().firstSector(), partition().fileSystem().lastSector());
-        CopyTargetDevice moveTarget(device(), newStart(), newStart() + partition().fileSystem().length());
+        qint64 length = partition().fileSystem().lastByte() - partition().fileSystem().firstByte();
+        CopySourceDevice moveSource(device(), partition().fileSystem().firstByte(), partition().fileSystem().lastByte());
+        CopyTargetDevice moveTarget(device(), newStart() * device().logicalSize(), newStart() * device().logicalSize() + length);
 
         if (!moveSource.open())
             report->line() << xi18nc("@info:progress", "Could not open file system on partition <filename>%1</filename> for moving.", partition().deviceNode());
diff --git a/src/jobs/restorefilesystemjob.cpp b/src/jobs/restorefilesystemjob.cpp
index 1387726..6b77e6d 100644
--- a/src/jobs/restorefilesystemjob.cpp
+++ b/src/jobs/restorefilesystemjob.cpp
@@ -66,8 +66,8 @@ bool RestoreFileSystemJob::run(Report& parent)
     // Again, a scope for copyTarget and copySource. See MoveFileSystemJob::run()
     {
         // FileSystems are restored to _partitions_, so don't use first and last sector of file system here
-        CopyTargetDevice copyTarget(targetDevice(), targetPartition().firstSector(), targetPartition().lastSector());
-        CopySourceFile copySource(fileName(), copyTarget.sectorSize());
+        CopyTargetDevice copyTarget(targetDevice(), targetPartition().firstByte(), targetPartition().lastByte());
+        CopySourceFile copySource(fileName());
 
         if (!copySource.open())
             report->line() << xi18nc("@info:progress", "Could not open backup file <filename>%1</filename> to restore from.", fileName());
diff --git a/src/jobs/shredfilesystemjob.cpp b/src/jobs/shredfilesystemjob.cpp
index 66f5b95..c713b5f 100644
--- a/src/jobs/shredfilesystemjob.cpp
+++ b/src/jobs/shredfilesystemjob.cpp
@@ -64,8 +64,8 @@ bool ShredFileSystemJob::run(Report& parent)
 
     // Again, a scope for copyTarget and copySource. See MoveFileSystemJob::run()
     {
-        CopyTargetDevice copyTarget(device(), partition().fileSystem().firstSector(), partition().fileSystem().lastSector());
-        CopySourceShred copySource(partition().capacity(), copyTarget.sectorSize(), m_RandomShred);
+        CopyTargetDevice copyTarget(device(), partition().fileSystem().firstByte(), partition().fileSystem().lastByte());
+        CopySourceShred copySource(partition().capacity(), m_RandomShred);
 
         if (!copySource.open())
             report->line() << xi18nc("@info:progress", "Could not open random data source to overwrite file system.");
diff --git a/src/ops/operation.h b/src/ops/operation.h
index 0f1d7c1..d4dd29f 100644
--- a/src/ops/operation.h
+++ b/src/ops/operation.h
@@ -94,7 +94,7 @@ protected:
     virtual ~Operation();
 
 Q_SIGNALS:
-    int progress(int);
+    void progress(int);
     void jobStarted(Job*, Operation*);
     void jobFinished(Job*, Operation*);
 
diff --git a/src/plugins/dummy/dummydevice.cpp b/src/plugins/dummy/dummydevice.cpp
index fb52984..ebd00eb 100644
--- a/src/plugins/dummy/dummydevice.cpp
+++ b/src/plugins/dummy/dummydevice.cpp
@@ -67,11 +67,11 @@ bool DummyDevice::createPartitionTable(Report& report, const PartitionTable& pta
     return true;
 }
 
-bool DummyDevice::readSectors(void* buffer, qint64 offset, qint64 numSectors)
+bool DummyDevice::readData(QByteArray& buffer, qint64 offset, qint64 size)
 {
     Q_UNUSED(buffer);
     Q_UNUSED(offset);
-    Q_UNUSED(numSectors);
+    Q_UNUSED(size);
 
     if (!isExclusive())
         return false;
@@ -79,11 +79,10 @@ bool DummyDevice::readSectors(void* buffer, qint64 offset, qint64 numSectors)
     return true;
 }
 
-bool DummyDevice::writeSectors(void* buffer, qint64 offset, qint64 numSectors)
+bool DummyDevice::writeData(QByteArray& buffer, qint64 offset)
 {
     Q_UNUSED(buffer);
     Q_UNUSED(offset);
-    Q_UNUSED(numSectors);
 
     if (!isExclusive())
         return false;
diff --git a/src/plugins/dummy/dummydevice.h b/src/plugins/dummy/dummydevice.h
index bdf8e32..3810fe1 100644
--- a/src/plugins/dummy/dummydevice.h
+++ b/src/plugins/dummy/dummydevice.h
@@ -45,8 +45,8 @@ public:
 
     bool createPartitionTable(Report& report, const PartitionTable& ptable) override;
 
-    bool readSectors(void* buffer, qint64 offset, qint64 numSectors) override;
-    bool writeSectors(void* buffer, qint64 offset, qint64 numSectors) override;
+    bool readData(QByteArray& buffer, qint64 offset, qint64 size) override;
+    bool writeData(QByteArray& buffer, qint64 offset) override;
 };
 
 #endif
diff --git a/src/plugins/libparted/libparteddevice.cpp b/src/plugins/libparted/libparteddevice.cpp
index f508017..4a3bc30 100644
--- a/src/plugins/libparted/libparteddevice.cpp
+++ b/src/plugins/libparted/libparteddevice.cpp
@@ -111,18 +111,22 @@ bool LibPartedDevice::createPartitionTable(Report& report, const PartitionTable&
     return LibPartedPartitionTable::commit(disk);
 }
 
-bool LibPartedDevice::readSectors(void* buffer, qint64 offset, qint64 numSectors)
+bool LibPartedDevice::readData(QByteArray& buffer, qint64 offset, qint64 size)
+{
+     if (!isExclusive())
+         return false;
+
+    void *data = malloc(size);
+    bool rval = ped_device_read(pedDevice(), data, offset / pedDevice()->sector_size, size / pedDevice()->sector_size);
+    buffer = QByteArray(static_cast<char*>(data), size);
+    free(data);
+    return rval;
+}
+
+bool LibPartedDevice::writeData(QByteArray& buffer, qint64 offset)
 {
     if (!isExclusive())
         return false;
 
-    return ped_device_read(pedDevice(), buffer, offset, numSectors);
-}
-
-bool LibPartedDevice::writeSectors(void* buffer, qint64 offset, qint64 numSectors)
-{
-    if (!isExclusive())
-        return false;
-
-    return ped_device_write(pedDevice(), buffer, offset, numSectors);
+    return ped_device_write(pedDevice(), static_cast<const void *>(buffer.constData()), offset / pedDevice()->sector_size, buffer.size() / pedDevice()->sector_size);
 }
diff --git a/src/plugins/libparted/libparteddevice.h b/src/plugins/libparted/libparteddevice.h
index 5958844..c8d98c0 100644
--- a/src/plugins/libparted/libparteddevice.h
+++ b/src/plugins/libparted/libparteddevice.h
@@ -47,8 +47,8 @@ public:
 
     bool createPartitionTable(Report& report, const PartitionTable& ptable) override;
 
-    bool readSectors(void* buffer, qint64 offset, qint64 numSectors) override;
-    bool writeSectors(void* buffer, qint64 offset, qint64 numSectors) override;
+    bool readData(QByteArray& buffer, qint64 offset, qint64 size) override;
+    bool writeData(QByteArray& buffer, qint64 offset) override;
 
 protected:
     PedDevice* pedDevice() {