I opened my desktop box and I saw 2 physical hard disks.

In Disks I can see /sda and /sdb,

Hard Disk ST


Hard Disk WD

but cannot access them or format them.

If I try to format them, I got this error:

Error wiping device: Command-line `wipefs -a "/dev/sda"' exited with non-zero exit status 1: wipefs: error: /dev/sda: probing initialization failed: Device or resource busy (udisks-error-quark, 0)

Strangely the master system disk is an additional one as this System Disk

By $ df -h, we can see

Filesystem                            Size  Used Avail Use% Mounted on
udev                                  7.8G     0  7.8G   0% /dev
tmpfs                                 1.6G  158M  1.5G  10% /run
/dev/mapper/isw_eacbecjdda_Volume1p2  910G  293G  599G  33% /
tmpfs                                 7.9G   93M  7.8G   2% /dev/shm
tmpfs                                 5.0M  4.0K  5.0M   1% /run/lock
tmpfs                                 7.9G     0  7.9G   0% /sys/fs/cgroup
cgmfs                                 100K     0  100K   0% /run/cgmanager/fs
tmpfs                                 1.6G  156K  1.6G   1% /run/user/1000

Only one 1TB disk is present, the system disk /dev/dm-0.

What's wrong with my system?

  • Why do you think anything is "wrong" with your system? is something not working? It looks like sda and sdb are configured as a single 1TB RAID volume (called dm-0), on which a 992GB Ext4 filesystem was created for your root filesystem. – steeldriver Jun 10 '16 at 13:10
  • @steeldriver I have two 1TB disks. But only 1T is available in the system. – Lee Jun 10 '16 at 15:01
  • The two disks appear to be configured together to form an Intel RST RAID mirror – steeldriver Jun 10 '16 at 15:08
  • it appears so but strangely 1TB is missing.... Ubuntu ate it...... – Lee Jun 10 '16 at 16:36
  • 2
    It is not missing. You can google what RAID is and you will find out why two disks of 1TB are shown as 1TB total. – Pilot6 Jun 10 '16 at 17:01

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