Introduced in the late 1980s, the Seagate ST-124 and ST-125 were 3.5-inch MFM hard drives offering around 20 MB of formatted capacity, helping accelerate the industry’s transition from bulky 5.25-inch mechanisms to more compact designs. Sharing identical storage capacity, the ST-125 featured a faster 28 ms average seek time versus the ST-124’s 40 ms, making it the higher-performance model. They became popular in IBM PC/AT compatibles, earning a reputation for reliability and widespread availability.

Details

Manufacturer	Seagate
Model	ST-124
Year	1989
Condition	Working
Source	Pete Farm
Acquired	2026-07-11
Mounted on	RH-0253 Western Digital WD1002A-WX1
Reference	https://theretroweb.com/harddrives/4746

Specs

Kind	Hard disk
Interface	MFM
Protocol	MFM
Capacity	20 MiB
CHS	615/4/17

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