Editing IBM PS/2 Model 50 (section)

=== Storage ===

* '''Floppy''': 1.44 MB 3.5" half-height, PS/2 single-cable interface. Drives are typically ALPS, Mitsubishi, Sony or YE-Data.
* '''Hard drive''' (8550-021): Seagate ST-506 20 MB (the famously slow 85 ms-access-time drive PC Magazine reviewers criticised) on the IBM Fixed Disk Adapter/A MCA card.
* '''Hard drive''' (8550-031): Seagate ST-506 30 MB on the IBM Fixed Disk Adapter/A. Twice the seek-speed of the 20 MB drive.
* '''Hard drive''' (8550-061): 60 MB ESDI on the IBM ESDI Fixed Disk Adapter/A.

The ESDI Fixed Disk Adapter/A is the same MCA controller used in the Model 60 (70 MB), Model 80 (70 MB, 115 MB), and other ESDI-equipped PS/2 systems. The drive plugs directly into a rear-edge connector on the controller card.