This is a used item where the 30GB HDD of a 5.5th generation (MA444J) has been replaced with a thick 60GB HDD. Basic operation has been confirmed. The backplate has also been replaced with one for the thick 60GB model. The battery is in good condition. (Continuous playback without operation: 19 hours, reference) The HDD's SMART diagnostics are normal. (Usage time: only 15 hours)