Xerox 820 system disks in Teledisk format?

ImageDisk is NOT a CP/M emulator like 22disk - it knows (or cares) nothing about high level disk formats (file systems). Although it has a F)ormat command, it's is a LOW-LEVEL format only and does not create a recognisable file system. It is mainly for testing and the creation of custom disks. You CAN low-level format mixed density disks with ImageDisk by making use of the track exclusion-map feature and F)ormatting the areas of the disk containing different track types individually - but this is a low-level format only - the OS may not recognize it (although it should be able to reformat it even if the system normally requires already low-level formatted disks). The best way to high-level "format" a disk with ImageDisk however, is to make an image of disk freshly formatted on the actual system, then simply W)rite it to new disks as needed. The Xerox should format the system tracks as part of it's normal format. If for some reason it does not, you could try any of the following: - Format the first 2 tracks in SD with ImageDisk (and the rest DD if necessary) and then format it in the Xerox to get the high level file system. - Make a second copy of your system disk, then format it in the system. - Make a second copy of your system disk and delete all the files (not quite as clean but logically a blank disk). - Use BIN2IMD to convert a binary file prepared with a blank file system image into a .IMD file that you can write - BIN2IMD lets you change track formats on the fly with an option file. Dave -- dave09 (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.classiccmp.org/dunfield/index.html