Hello so this is the issue. I have win vista x64,sp2. Toshiba satellite and a Seagate freeagent goflex 1tb external HD. I had been using the external for a while. noticed some information wasnt really working properly. I thought I would do a chkdsk. However, I used Tuneup utilities to perform the thorough chkdsk of my external HD, i figured it would find and fix any bad clusters. WRONG. after 20hrs of waiting. I restarted the PC, and now i cant access any information. The external shows up in "computer" I can open certain folders but after a few mins I cant access anything and i get the I/O device error... ive tried running chkdsk /r just from the PC in a CMD window. It shows a list of 30-50 files that are "unreadable" and sticks on a certain file at around 6% complete every time. Ive tried all of seagates suggestions and other then that everyone else just says to run chkdsk on other forums. I really do not want to loose this information at all costs... any information would be fantastic. thanks for your help in advance.