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.
| 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 | 3-Year 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 Seagate ST-225 is a 20MB MFM hard disk drive designed for vintage computers, legacy systems, and retro computing applications. It is suitable for restoring and maintaining compatible older computer systems.
The Seagate ST-225 20MB MFM Hard Disk Drive is a classic storage drive designed for vintage computers and legacy systems. It features a 20MB storage capacity and uses the MFM (Modified Frequency Modulation) interface found in many older computer systems. The ST-225 is suitable for vintage PC restoration, retro computing, legacy hardware maintenance, industrial systems, and computer collections. Its original-era design makes it a useful replacement for compatible older systems requiring an MFM hard drive. This drive is not compatible with modern SATA or SAS systems. A compatible MFM controller, cabling, and system configuration are required for operation. Always verify compatibility before purchase, especially when replacing an existing vintage hard drive.
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.