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I extracted the disk from a Mybook World 2 (White Led). The device has only this 1TB SATA disk, and it seems it is using RAID1

This is a report from disktype:

francesco@blackhole:~$ sudo disktype /dev/sdb
--- /dev/sdb
Block device, size 931.5 GiB (1000204886016 bytes)
DOS/MBR partition map
Partition 1: 1.869 GiB (2006974464 bytes, 3919872 sectors from 64320)
  Type 0xFD (Linux raid autodetect)
  Ext3 file system
    UUID 78C28AA5-BDFD-4BE6-9F58-90158E3B0E34 (DCE, v4)
    Volume size 1.869 GiB (2006908928 bytes, 489968 blocks of 4 KiB)
  Linux RAID disk, version 0.90.0
    RAID1 set using 2 regular -1 spare disks
    RAID set UUID 03D291C1-5D91-F02A-42F0-E4F5C3F82B1D (NCS)
Partition 2: 251.0 MiB (263159808 bytes, 513984 sectors from 3984192)
  Type 0xFD (Linux raid autodetect)
  Linux RAID disk, version 0.90.0
    RAID1 set using 2 regular -1 spare disks
    RAID set UUID A1A39027-5114-9598-6F0E-78C3AC55D2B2 (NCS)
  Linux swap, version 2, subversion 1, 4 KiB pages, little-endian
    Swap size 250.9 MiB (263053312 bytes, 64222 pages of 4 KiB)
Partition 3: 964.8 MiB (1011712000 bytes, 1976000 sectors from 4498176)
  Type 0xFD (Linux raid autodetect)
  Ext3 file system
    UUID 0AEEE999-BE23-4CC1-A5B8-71EBE9DF871E (DCE, v4)
    Volume size 964.8 MiB (1011613696 bytes, 246976 blocks of 4 KiB)
  Linux RAID disk, version 0.90.0
    RAID1 set using 2 regular -1 spare disks
    RAID set UUID 71CAFCD8-5E07-B57B-1C59-C590CF05141F (NCS)
Partition 4: 928.4 GiB (996887495168 bytes, 1947045889 sectors from 6474176)
  Type 0xFD (Linux raid autodetect)
  Linux RAID disk, version 0.90.0
    RAID1 set using 2 regular -1 spare disks
    RAID set UUID 8B3DEF8B-534C-90D1-D7BA-B2FE15673C8F (MS GUID)
  XFS file system, version 4
    Volume name ""
    UUID 100D6A32-784A-4250-9B41-8E193B998415 (DCE, v4)
    Volume size 928.4 GiB (996887363584 bytes, 243380704 blocks of 4 KiB)

The important files are in sdb4.

I tried to mount it:

sudo mount -t xfs -o ro /dev/sdb4 /media/recovery/

But it fails saying that the filesystem is wrong, or the superblock damaged.

I also tried mdadm:

sudo mdadm --assemble /dev/md4 /dev/sdb4
mdadm: no recogniseable superblock on /dev/sdb4
mdadm: /dev/sdb4 has no superblock - assembly aborted

Any idea to access the XFS filesystem?

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migrated from serverfault.com Nov 1 '12 at 16:03

This question came from our site for system and network administrators.

2  
"The device has only this 1TB SATA disk, and it seems it is using RAID1" If it only has one drive, it's not using RAID1. Just restore from backup. –  EEAA Nov 1 '12 at 14:54
    
How can I recover it if I cannot mount it? And why disktype reported "Linux raid autodetect" as partition type? –  Francesco Nov 1 '12 at 15:10
    
Unless he was mirroring to partitions. Which is totally insane if you know how RAID works, but it would not be the first time I encountered this. –  Hennes Nov 1 '12 at 15:11
    
Hennes: no, it is not mirroring two partitions. –  Francesco Nov 1 '12 at 15:12
1  
@Francesco - you recover from a backup. –  EEAA Nov 1 '12 at 15:42

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