I did the same thing with me old SCSI HD. The Quantum Viking x390 With 4gb of disk space. ............ .......... That was back when i had a Macintosh. I miss that old thing. Basically what i'm saying is that you OVERDIDIT!!! You despreteley need a new HD.
Try the freezer method? Wrap your hdd in a towel then put it in the freezer for 20-30 minutes then try it.... BTW I have a bunch of porn that I can burn on discs and have shipped to you if you want... About 2.3gb as of now...