Here's the link for MS error code description:
I'm pretty sure when you tried various methods to clear the HD, you generated a problem. If you have s/w from WD, use it to correct or prepare the ext. HD again. If push comes to shove, remove the HD itself from small case and try seeing as an int. HD via the system. If it does see it then, you have to format, etc. to prepare the HD and then return to case. However, if you have any warranty, use it as an option. Now, these ext. HDs do fail either the HD has or the interface card(guts of case) has failed. Heat is a problem for any HD, but ext. HDs if no fan setup will die sooner or later due to this. Did you try this ext. HD on another system? Did you visit the WD support website for hints/tips/clues to repair its problem? get any "LifeGuard" or similar test/diag s/w to help resolve problem from WD?
I have a Western Digital 120GB USB HD that I use as a data drive (music, pics, archives, that kinda stuff). I've had the drive for a few years and all was fine. Recently, I noticed that there was only 1 file visible on the drive but the disk space (free/used) was still reporting it as it should have been with all my files present. I attempted to virus scan and no virus. Attempted to delete and was told not allowed or something. I went to DOS and attempted to delete that way and was told something like unable-directory structure tree to deep. Now, after attempting to reinstall the drive, I get the Device cannot start (code 10) error.