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I have a dynamic disk with a limit of 2 TB space and in actual size it has occupied 56.2 GB space on the NTFS partition with Windows 7 Host which has another 60 GB remaining space.

Command: df -h Shows

Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1             2.0T  4.1G  1.9T   1% /
none                  4.0K     0  4.0K   0% /sys/fs/cgroup
udev                  235M  4.0K  235M   1% /dev
tmpfs                  50M  512K   49M   2% /run
none                  5.0M     0  5.0M   0% /run/lock
none                  246M  4.0K  246M   1% /run/shm
none                  100M     0  100M   0% /run/user
/dev/sdb1             2.0T   11G  1.9T   1% /var/dev
/home/starx/.Private  2.0T  4.1G  1.9T   1% /home/starx

Means the system disk in only 4.1 GB in real size. And I am getting BLKCACHE_IOERR Error regularly.

When I cloned the hdd to another hoping only the real size will appear it only decreased from 58 GB to 56 GB.

I want to be remove this error and want to thrink 56.2 GB to 4.1 GB which is the real size. How can I get around this issue.

Virtualbox Version is: 4.3.0

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