Technical specifications Performance specifications as known at time of announcement Formatted capacity 20.4 GB: 20,400 MB Rotational speed: 7200 rpm Average latency: 4.2 ms Typical average read seek time: 8.7 ms Data buffer (adaptive segmented): 2 MB Interface performance: Ultra ATA/100 Burst transfer rate (maximum): 100 MBps Sustained data transfer rate: 18 to 36 MBps