| model number | ST34311A | ST36421A | ST38421A | |
| capacity | GB | 4.3 | 6.4 | 8.4 |
| buffer size | kB | 256 | 256 | 256 |
| heads | 2 | 3 | 4 | |
| areal density | MB/in2 | |||
| track density | tpi | |||
| recording density | kbpi | |||
| average seek | ms | 10.50 | 10.50 | 10.50 |
| rotation speed | RPM | 5400 | 5400 | 5400 |
| media rate (max.) | MB/s | 25.75 | 25.75 | 25.75 |