HDD shows as 'unallocated' when swapped into another server

I have a non booting DELL PowerEdge T105 server running Win2K3, when I swap the HDD from this server into a PowerEdge T110 running Win2K12 it shows as unallocated in Disk Management - this HDD has a lot of critical data on it that isn't backed up - any suggestion why this would occur and how to resolve please?
t38Asked:
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rindiCommented:
Normally you use RAID on a server, and don't just have one disk to make up the array. Depending on what type or RAID you used, you may need all the disks in order to read the data off the array.

I would return the disk into the original server, then boot it using a Linux Live CD, like the SystemRescueCD, then if it sees your array as a RAID array, and not as the single disks that make up the array, you can try mounting the partitions and copying the data you need off:

http://distrowatch.com/table.php?distribution=systemrescue
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t38Author Commented:
Thanks for your response Rindi - I'll attempt that and revert.
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t38Author Commented:
That did it - all the HDD's showed when I booted up with the full array - thanks for your assistance, much appreciated.
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