Sounds of the IBM WD-25 

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International Business Machines Winchester Disk 25
Country of Origin: USA
Introduced: 1982
Interface: ST-412 (MFM nominal)
Capacity: 20MB
Form: 5.25 FH
CHS: 306 / 8 / 17
LZN: 310
WPC: 296
Track-track: 16.8ms
Linear access: 52.2ms
Random access: 86.1ms
Rotational: 3600RPM
Media: Ferrous, inline TF heads
Disks: 4
Actuation: Rotary band swingarm stepper
Feedback: None
Lift/Lock/Park: Lock
Brake: Dynamic
Service life: Unknown
Related models: WD-12 (2 disk)
Failures: Unknown
Settings: aioinc.ddns.net/HOST/TH99/h/tx...
My thoughts:
Like the WD-12, this drive is worthy of praise. IBM really made a great showing with their early microwinchester offerings, and the four platter WD-25 is no exception. There are very few 4 disk drives in this era, and IBM's is certainly the best. I recommend it for both it's low cost, high performance, high reliability, wonderful sound, and for just how common it is.

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