The Commodore D9090 is a 7.5 MByte hard disk. The hard disk has 3 platters with 6 read / write heads. The total number of available blocks is 29159.
- Sectors per track: 32
- Bytes per sector: 256
- Cylinders: 153
- Sectors per cylinder: 192
- Average access time: 153 msec
- Rotation speed: 3600 rpm
- Weight: 10 kg (21 lbs)