Re: HDD Not Recognized
If you initialize it, you'll wipe the drive, FYI.
If it doesn't show up as a drive letter, or takes a drive letter assignment, it's not going to work.
What type of system was it in prior to you putting it into an enclosure? If it was in something other than a Windows PC, you'll have to download a converter program that can read from other file formats, or boot your system up to a Linux boot CD to see if it can read it instead.