I recently had issues with the 880k drive in my A3000. It was caused by the sensor switch getting gunked up with years of grunge. I took the A3000 case off and blew out the drive's visible gunk with some canned air. I then took a q-tip and alchol and GENTLY swabbed the sensor. The drive came back to life and has been working fine since.
Hope this helps!
Bob
