On Sun, 1 Feb 2009, Dan Gahlinger wrote: > would this in any way to be related to the IBM PC 'ED' disks? > the 2.1MB floppies that were out for a while? Good thought, but no. Those were 300 RPM, 1000K bps data transfer rate. 80 tracks, 2 sides, 36 sectors per track, 512 bytes per sector. divided by [how many bytes in a Megabyte?]