December 30th, 1981:

IBM Corporation announced it’s release of DOS 1.1. The first ever OS Patch.The New release fixed over 300 bugs found in the original OS written by Microsoft under contract for IBM and released 5 months earlier.

One of the new features. The Ability to write on both sides of a 5 1/4 inch floppy. That gave the user the ability to only load one disk to boot up hugely memory intensive word processing programs that were over the 128KB limit of the single Sided Digital Disk (SSDD). The Double Sided Digital Disk (DSDD) and it’s incredible 1/4 Megabyte of data went through another revolution in 1983 with the advent of the 3 1/2 Disk. When the DSDD version of the 3 1/2 was released there was almost a 1/2 Megabyte of data on a single disk. The Operating System used 2 of these memory behemoths.

Ah the good all days.