diff --git a/src/fs/ext2.cpp b/src/fs/ext2.cpp
index 5646d2c..533b92d 100644
--- a/src/fs/ext2.cpp
+++ b/src/fs/ext2.cpp
@@ -84,7 +84,7 @@ FileSystem::SupportTool ext2::supportToolName() const
 
 qint64 ext2::maxCapacity() const
 {
-    return 32 * Capacity::unitFactor(Capacity::Byte, Capacity::TiB);
+    return 16 * Capacity::unitFactor(Capacity::Byte, Capacity::TiB) - Capacity::unitFactor(Capacity::Byte, Capacity::MiB);
 }
 
 qint64 ext2::maxLabelLength() const
diff --git a/src/fs/ext3.cpp b/src/fs/ext3.cpp
index c8f3de2..aa6d9f8 100644
--- a/src/fs/ext3.cpp
+++ b/src/fs/ext3.cpp
@@ -31,7 +31,7 @@ ext3::ext3(qint64 firstsector, qint64 lastsector, qint64 sectorsused, const QStr
 
 qint64 ext3::maxCapacity() const
 {
-    return 32 * Capacity::unitFactor(Capacity::Byte, Capacity::TiB);
+    return 16 * Capacity::unitFactor(Capacity::Byte, Capacity::TiB) - Capacity::unitFactor(Capacity::Byte, Capacity::MiB);
 }
 
 bool ext3::create(Report& report, const QString& deviceNode) const