Description

Seagate ST3120A 107MB IDE Hard Drive

Classic 3.5-inch slim-line IDE hard drive from Seagate’s early 1990s lineup. The Seagate ST3120A offers 107 MB (approximately 120 MB unformatted) of reliable storage, making it a perfect choice for restoring vintage 386, 486, and early Pentium PCs.

*** Hard drive is tested for no bad sectors and is formatted as a FAT32 partition.

Key Specifications:

• Capacity: 107 MB formatted (≈120 MB unformatted)
• Form Factor: 3.5-inch Slim-Line (SL) – low-profile design
• Interface: IDE / ATA (AT-Bus, 40-pin)
• Spindle Speed: 3,200 – 3,211 RPM
• Cache Buffer: 32 KB
• Average Seek Time: ~17–19 ms
• Data Transfer Rate: Up to 8–10 MB/s (PIO Mode)
• Geometry: 1024 cylinders / 12 heads / 17 sectors
• Power: Standard +5V / +12V Molex connector
• Jumper Configurable: Master / Slave / Cable Select

Built for Retro Computing

This genuine Seagate drive was widely used in mid-1990s desktop computers. It excels in period-correct restorations, DOS, Windows 3.1, Windows 95/98 systems, and retro gaming builds.