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I have 2 disks, sda and sdc with the following gdisk output:

$ sudo gdisk -l /dev/sda
GPT fdisk (gdisk) version 0.8.8

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/sda: 7814037168 sectors, 3.6 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): 83E2C8AF-B99A-4DF3-84F2-6783DA14E485
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 7814037134
Partitions will be aligned on 8-sector boundaries
Total free space is 0 sectors (0 bytes)

Number  Start (sector)    End (sector)  Size       Code  Name
   1              34            2081   1024.0 KiB  4201  LDM metadata partition
   2            2082          262177   127.0 MiB   0C01  Microsoft reserved part
   3          262178      7814037134   3.6 TiB     4200  LDM data partition

$ sudo gdisk -l /dev/sdc
GPT fdisk (gdisk) version 0.8.8

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/sdc: 7814037168 sectors, 3.6 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): 1FB7A5CB-94F3-490D-883A-2BB598F9794E
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 7814037134
Partitions will be aligned on 8-sector boundaries
Total free space is 0 sectors (0 bytes)

Number  Start (sector)    End (sector)  Size       Code  Name
   1              34            2081   1024.0 KiB  4201  LDM metadata partition
   2            2082          262177   127.0 MiB   0C01  Microsoft reserved part
   3          262178      7814037134   3.6 TiB     4200  LDM data partition

There is no blkid information for either of this disks, only for the OS:

$ sudo blkid
/dev/sdb1: UUID="e7679bdc-374c-416a-affe-4e5f3eefdfab" TYPE="ext4"
/dev/sdb5: UUID="07c5f04e-e173-42ad-a6f8-429b9d035f2b" TYPE="swap"

I have tried mounting the NTFS raid using variations of sudo mount -t ntfs-3g /dev/sd[ac][1-3] /mnt, but fails with the same response:

NTFS signature is missing.
Failed to mount '/dev/sda3': Invalid argument
The device '/dev/sda3' doesn't seem to have a valid NTFS.
Maybe the wrong device is used? Or the whole disk instead of a
partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?

It seems obvious that the disks are not NTFS formatted, but I formatted them in Windows and checked the disks before I plugged them into the ubuntu environment - so definitly are NTFS.

Does anyone have an idea of how I can mount the RAID 0 disks?

1 Answer 1

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Both disks have partitions of type 4200 and 4201, which denote Microsoft Logical Disk Manager (LDM), which is Microsoft's equivalent to the Linux Logical Volume Manager (LVM). As such, you can't mount these partitions directly, because the filesystems they contain are held in containers within the partitions. The Linux kernel includes LDM support, but I don't recall offhand if that support is included in Ubuntu. If it is, you'll see device files for the logical volumes in the Linux /dev/mapper/ directory, or a subdirectory thereof. I recommend you check there. You clearly already know how to use blkid, so you can use it to identify NTFS volumes.

One more thing: You said these disks are RAID 0 devices. If this was set up with the motherboard's software RAID, you'll need to activate that support, as described here:

https://help.ubuntu.com/community/FakeRaidHowto

Note that the RAID devices are likely to show up in /dev/mapper, too. Using LDM on top of dmraid could get complex. (I've never used this particular combination.)

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  • Thanks for the reply. I checked the /dev/mapper, but the devices did not show up there either. It just got to painful, so I ended up taking the easy way out; reformatting the disks and setting up a new RAID 0 array. Thanks anyway :)
    – JAM
    Mar 15, 2015 at 19:16

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