Seagate ST-251

A detail view to R/W head and servo.

A bottom view to ST-251.

A top view to the electronics board, removed from hard disc.

A bottom view to hard disc with removed electronics board.

Seagate ST-251 hard drive

My oldest hard drive ST251 is a half-height 5.25 inch from 1990 has 42 MB formatted capacity, FM recording method, ST-412 interface and average seek time 40 ms.

The hard drive is without cover and still works. MS DOS 5.0 is on it. The hard drive is in the display case. I start it once a year at Christmas and see if it works. If my PC-XT booted from it, that's fine. So again next Christmas.

TECHNICAL DETAILS
 
MANUFACTURER   Seagate Technology Inc.
MODEL ST-251
YEAR 1990
ORIGIN Thailand
CAPACITY 42.8 MByte formatted
51.2 MByte unformatted
INTERFACE ST 412 MFM
POWER 5Volt,
12Volt DC
max. 30 Watts
FORM FACTOR 5¼" half height
SNR 26926050