Error Code 2STF/1/4

I was cleaning files from my iBook G4 using Secure Empty Trash when it froze. Upon restart I get a file folder with the Mac face alternating with a question mark. I tried to reinstall the software from the original disc, but at the step to select a destination there seems to be no hard drive. I then did the hardware test from the original disc, with a mass storage error detected and error code 2STF/1/4. What does this mean, and is there anything I can do to repair this to the point to sell it?

JUlie