Out of the blue my 2.5" samsung HM641JI became inaccessible or corrupt... I have been trying everything I can find to repair it. I've run chkdsk /r; I've run chkdsk with 'Automatically fix file system errors' and 'Scan for and attempt recovery of bad sectors'. I've downloaded and attempted using SeaTools... All to no avail. The tests always stall-out. I have even let them run for nearly 20 hours hoping it would work through whatever is wrong with the file system.