| model number | WD91AW | WD136AW | WD181AW | WD272AW | |
| capacity | GB | 9.1 | 13.6 | 18.1 | 27.2 |
| buffer size | kB | 2048 | 2048 | 2048 | 2048 |
| heads | |||||
| areal density | MB/in2 | ||||
| track density | tpi | ||||
| recording density | kbpi | ||||
| average seek | ms | 9.50 | 9.50 | 9.50 | 9.50 |
| rotation speed | RPM | 5400 | 5400 | 5400 | 5400 |
| media rate (max.) | MB/s | ||||