It may have suffered some damage if you unplugged it without ejecting first. Try hooking back up to that original PC, and running chkdsk on it: click Start, and type: cmd right-click the cmd icon at the top of the list, and Run As Admin. Then type: chkdsk x: /r where x: is the drive letter of the drive.
If it doesn't HAVE a drive letter in Computer, go to diskmgmt, and see if you can assign one. If not, you may have borked the drive, and need to reformat. Sorry man.
Always remember to EJECT the drive before unplugging it! It is for the safety of your files. Otherwise, the drive will still be spinning, and some data may get scratched!
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