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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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any idea how to do this on a Mac? I'll be needing an Ext4 driver for sure, but is there anything else that need to do to mount the formerly RAID-1 drive? – adib Nov 26 '14 at 15:50

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 '12 at 17:50

An important step is to have mdadm scan for the disk prior to attempting to mount anything:

mdadm --detail --scan

I can't recall from memory but the --assemble flag may be necessary but try the above first then try mounting via:

mount /dev/md# /path/to/mount 
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