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I need to copy data from a single HD, which used to be part of a Linux RAID 1. I've googled around, but can't find any clue how to mount partitions from this single HD.

Background: The HD comes from a linux based NAS box Synology DS207+. The NAS uses ext3 as filesystem. Both NAS disks are fine, but the other NAS hardware is dead and not worth repairing or replacing.

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Luckily is was RAID1 and not RAID0! – Rob Apr 26 at 17:40
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When you only have a single part of a Raid array, it is in an incomplete state and for safety reasons, you basically have to force mount it.

There are many linux distributions, for me, in Ubuntu, I used:

 mkdir /mnt/tempdisk
 sudo mount /dev/sda3 /mnt/tempdisk -o force

(replace sda3 with the hard drive)

if a *nix expert wants to down vote me, I will delete my answer as it has been a few years since I did this, and I followed a guide at the time.

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You don't have to force anything. Just mount the md device: "mount /dev/md1 /mnt/myfolder". The degraded array will run without any problem. But nothing garantee the Symbology use a standard Linux RAID. – Gregory MOUSSAT Apr 26 at 17:50
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