Doesn't mean that the Drive is actually working it only means that the USB Enclosures Driver has been loaded and there are no conflicts.
Can you try this drive with a different computer and see what if anything it shows up as?
Or can you refit it to your Old Computer and remove any passwords that are on the Drive?
If you have used your old case and replaced the internals you can connect everything up on a table and start the thing running there. Just sit the M'Board on Clean White Paper to prevent any damage to it. You may be able to run it on the old system and with a Ethernet Cable transfer the Data Across to the New Computer.
Then when you have recovered your Data you can then set about wiping that HDD and formatting it on the other computer for Backup Purposes.
If the Drive can not be read in the original computer it may have failed and you need to test it with the Makers Testing Utility for function.
If the drive is working and the Partitions have been corrupted you need to use some form of Data Recovery to recover your Data or to rebuild the Partition Tables.
Here is a short list of the better ones
http://tinyurl.com/273ay5
http://tinyurl.com/rmvrv
http://tinyurl.com/yvrsl
http://tinyurl.com/yyk8cm
http://tinyurl.com/382vm
http://tinyurl.com/ynwnel
http://tinyurl.com/nc4kx
http://tinyurl.com/2wox7l
http://tinyurl.com/374d8b
http://tinyurl.com/djw6u
http://tinyurl.com/f73se
http://tinyurl.com/8bd3f
http://tinyurl.com/afu2j
While the last 2 are from the same company they are very different products. Win Hex should only be considered foe use by someone who knows Hex Inside Out while Davory is a great cheap General Purpose Application.
Personally I prefer the On Track Option but it's anything but cheap. However because I use this type of software a lot it's paid for itself many times over by now, for a cheaper option Spin Rite from Gibson Research or Stella have both very good reputations by other TR members.
Col