| model number | AC29100 | AC418000 | WD102BA | WD136BA | WD205BA | WD273BA | |
| capacity | GB | 9.1 | 18.0 | 10.3 | 13.7 | 20.5 | 27.4 |
| buffer size | kB | 2048 | 2048 | 2048 | 2048 | 2048 | 2048 |
| heads | 4 | 8 | 3 | 4 | 6 | 8 | |
| areal density | MB/in2 | ||||||
| track density | tpi | ||||||
| recording density | kbpi | ||||||
| average seek | ms | 9.00 | 9.00 | 9.00 | 9.00 | 9.00 | 9.00 |
| rotation speed | RPM | 7200 | 7200 | 7200 | 7200 | 7200 | 7200 |
| media rate (max.) | MB/s | 28.04 | 28.04 | 35.50 | 35.50 | 35.50 | 35.50 |