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I have a 2TB drive from my two-bay Synology NAS that I want to access via Linux Mint.

fdisk shows:

root@HUB:/# fdisk -l
Disk /dev/sda: 111.8 GiB, 120033041920 bytes, 234439535 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xe3fd87a9

Device     Boot Start       End   Sectors   Size Id Type
/dev/sda1  *     2048 234438655 234436608 111.8G 83 Linux


Disk /dev/sdb: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x8a9e15a2

Device     Boot   Start        End    Sectors  Size Id Type
/dev/sdb1          2048    4982527    4980480  2.4G fd Linux RAID autodetect
/dev/sdb2       4982528    9176831    4194304    2G fd Linux RAID autodetect
/dev/sdb3       9437184 3907015007 3897577824  1.8T  f W95 Ext'd (LBA)
/dev/sdb5       9453280 3906822239 3897368960  1.8T fd Linux RAID autodetect

When I try to mount I get:

root@HUB:/# mount /dev/sdb5 /mnt
mount: /mnt: unknown filesystem type 'linux_raid_member'.

Tried following this guide to create an md virtual device but get this message:

root@HUB:/# mdadm -A -R /dev/md1 /dev/sdb5
mdadm: /dev/sdb5 is busy - skipping

Any ideas?

  • 1
    Can you add the contents of “/proc/mdstat” to your question? – jsbillings Jan 2 at 12:21

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