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My old harddisk was having I/O error last week so I tried to copy the data out to another new disk intending to rescue the data. I use ddrescue:

ddrescue -f /dev/sda1 /dev/sdb1 my_mapfile

After I use ddrescue to clone the whole partition from old to new disk (it already partitioned upfront), I able to save my data and I am able to mount it and read my data in the new drive without problem.

Now the strange thing is when I do a df, I have such output:

Filesystem                          1K-blocks                Used             Available Use% Mounted on
/dev/sdb1                64735862822350640424 1444576192909379016 -10495689665396945056    - /mnt/new_partition

If I do a ''df -hT'', I got this:

Filesystem               Type      Size  Used Avail Use% Mounted on
/dev/sdb1                jfs        56Z  2.0Z   -9Z    - /mnt/new_partition

Both the old and new partition is 2TB.

Anybody know why I can't get the 'Use%' output and why there is a 'Z' symbol there and negative 'Avail' reading ?

I didn't do any other tuning after done the ddrescue cloning though.

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    Z = Zettabyte. Figures are abnormal due to some sort of metadata corruption. en.wikipedia.org/wiki/Zettabyte – steve Dec 20 '16 at 8:08
  • @steve: metadata corruption ? where is that metadata located and how to fix that ? I did guest it might be Zettabyte but my hddisk is only 2TB. Do you have any same experience before ? – sylye Dec 20 '16 at 9:16

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