with all original parts. This is the middle era diskette drive, and an IBM 20 MB hard drive. . This worked: A:>Debug c/r - -I 322 c/r -I 321 c/r -O 322 0 c/r -I 321 c/r -O 320 04 c/r -O 320 00 c/r Note: This is the value for Drive C. Substitute 20 if formatting Drive D. -O 320 00 c/r -O 320 00 c/r -O 320 05 c/r -O 320 07 c/r Note: Before you hit this carriage return, be sure you have typed the correct value shown in the previous note for drive C or D. Drive light should come on at this point and the controller will begin doing a low-level format on the drive. [It takes quite a while, a good time to re-watch Lord of the Rings...] When the drive has been formatted, the drive select light will go out and you will be returned to the - prompt. -I 321 c/r -I 320 c/r -Q And you should now be back at the DOS prompt. At this point you should enter FDISK, set the partition, and perform your high level format. [thanks Marvin Johnson and http://www.uncreativelabs.net/textfiles/drives/XEBEC.DOC