While regular readers of this column will appreciate that I am long in tooth (the corollary being that I am short in memory) – I still remember 8 inch 1.2MB floppy disks that would only hold less than 1MB under CPM.
My first I.T. task before I jumped ship form electronics to computing was diagnosing an elderly CPM based word processing system that had 5.25 inch floppy drives and an equally mature Enhanced Small Disk Interface (ESDI) hard drive. Based on the old ST506/412 interface originally devised by Seagate Technology, in the early 80′s ESDI was a common sight for the field engineer. While I cannot remember the exact capacity of the drive, it was only double digit Megabytes – if that. After a time examining the system, it was clear that the hard disk was either encountering a large number of consecutive bad sectors or had suffered a head crash, as the endless “Skip Retry Ignore” prompt testified.