Brand: Seagate · SKU: ST-225 · MPN: ST-225 · Category: Components
The Seagate ST-225 is a legendary 5.25-inch half-height hard disk drive, widely considered the most successful and best-selling hard drive of the 1980s. Offering 21.4 MB of unformatted and 20.4 MB of formatted capacity, it utilizes the Modified Frequency Modulation (MFM) encoding scheme via the industry-standard ST-412/ST-506 interface. Known affectionately as 'Old Reliable,' the ST-225 was a staple for IBM PC/XT and AT compatibles. It features a stepper motor actuator, four read/write heads, and two oxide-coated platters. Its rugged construction and 20,000-hour MTBF made it the standard for early desktop storage solutions.
| MTBF | 20,000 hours |
|---|---|
| Heads | 4 |
| Cylinders | 615 |
| Interface | MFM (ST-506 / ST-412) |
| Form Factor | 5.25-inch Half-Height |
| Rotational Speed | 3,600 RPM |
| Average Seek Time | 65 ms |
| Sectors per Track | 17 |
| Data Transfer Rate | 5.0 Mbits/sec |
| Capacity (Formatted) | 20.4 MB |
| Warranty | Vintage Hardware - Sold As-Is / No Manufacturer Warranty |
| Weight | 2.75 lbs (1.25 kg) |
| Dimensions | 1.63 x 5.75 x 8.00 inches (41.4 x 146 x 203.2 mm) |
The definitive 20MB MFM hard drive of the early computing era, providing reliable storage for vintage x86 systems.
Yes, this Seagate ST-225 20MB MFM Hard Disk Drive (ST-225) is 100% genuine Seagate hardware. All our products are verified by certified technicians and come with clean serial numbers ready for service contract registration.
This Seagate ST-225 20MB MFM Hard Disk Drive includes our standard 3-Year Warranty covering all manufacturing defects. We also offer advanced replacement options for minimal downtime.
We offer free ground shipping which typically takes 3-5 business days. Expedited shipping options are available at checkout for faster delivery.
Yes, we have a 30-day return policy on all products. Restocking fees may apply for opened items. Please see our return policy for complete details.
Please check the specifications tab for detailed compatibility information. Our technical team is available to assist with compatibility questions for the ST-225.