Jerome Fine replies: The only floppy drive that I am familiar with from Data Systems Design was in the DSD 880/30 unit. This was for the Qbus and included a dual height card as the interface to the Qbus. Inside the box was an 8" hard drive and an 8" floppy drive. The floppy drive was RX02 compatible when used with the associated boards. In addition, the drive was able to sense and use double-sided media or what DEC would have called RX03. Note that for 8" floppy media (as opposed to 5 1/4" floppy media for which the single and double sided media were identical), the location of the index hole for single sided media was about an inch away from the location of the index hole for double sided media. Thus the jacket for single sided media had holes on each side in a location hat was very different (by the one inch shift) for double sided media. In addition, the double sided drives allowed both single sided and double sided operation - which meant that there were two light emitting diodes and two light sensors in addition to the second head which could read the second side. Sincerely yours, Jerome Fine -- If you attempted to send a reply and the original e-mail address has been discontinued due a high volume of junk e-mail, then the semi-permanent e-mail address can be obtained by replacing the four characters preceding the 'at' with the four digits of the current year.