An assortment of notes: You need to boot to real/raw DOS ... IMD doesn't work under windows. If you are booting from a floppy, know that IMD reconfigures the controller rendering it inaccessable by DOS while IMD is accessing the disk - so it can't read/write the image file from/to a different floppy. I have a boot disk image on my site that boots and runs from a RAMdisk and contains network tools to transfer the image off (or you can ZIP it to a floppy after IMD is finished). If you are booting to real/raw DOS ... does the drive work under DOS.? Can you FORMAT 1.2M and 360k disks under DOS and read/write them.? If not, you have a hardware problem (for DOS, make sure it is configured correctly in BIOS - IMD doesn't use BIOS settings though). Make sure you are using DD media, and NOT HD media - for 5.25" diskettes, DD media usually has a reenforcing ring around the edge of the center hole, and HD diskettes usually do not have it 1.2M drive spins at 360rpm ... DD drive spins at 300rpm ... my Keypro disks were read on a real DD drive, so they are encoded at 250kbps. If you write them to a 1.2M spinning at 360rpm, you need to set a speed translate 250->300 in order for the density to come out right. My docs and help contain more details on this. I assume It goes without saying, but to use 1 2M drive, you need an AT or later style controller capable of handing HD drives. If you use a DD only controller, you need to tell IMD this - there's a command line option - note that this would only work on DD drives (obviously). I've had issues with 300kbps on certain controllers - mostly with single- desnity (IIRC k4 disks don't use SD) --- I've got info on my site on modifying 1.2M drive to run at 300rpm/250kbps which may work better for you. Also IIRC, some of my kay disks have an extra SD track-40 (41), which existed on the original disks ... I doubt it's required, but I left the images exactly as read when I posted them - if your setup only fails on track-40, try the disks as they will probably work anyway. 1.2M drive is a 96tpi drive. Kaypro disks are for 48tpi drives - you will need to set double-stepping when recreating the disks -- otherwise you won't be able to read them in the 48tpi DD drive. 96tpi drives (like your 1.2M) lay down thinner tracks than 48tpi drives (regular DD drives) - you may have issues reading disks that were written on 48tpi, then re-written on 96tpi, then read on 48tpi ... note that most of the time it works for me, and it would not be the cause of errors writing and reading on the 96tpi drive ... only reading them on the 48tpi after rewriting them on 96tpi ... you can bulk erase the disk prior to creating it in the 96tpi drive if this is causing you grief. If none of the above help, get back to me with exactly what your hardware setup is, what media you are using, what speed your drive is running (There's a test-RPM command in IMD) - and I'll try to come up with some more suggestions. Dave PS: Regarding using TM-100 in PC ... I believe I have gotten one to work, but I find more "modern" 1/2 height DD drives much easier to work with on a PC - PC expects drive to be jumpered as drive 2 (or 1 if counting from zero) and has issues with signals due to it's "rolled cable". IRC you need to jumper the drive (or connector) to provide motor-on with select - it's been quite a while since I worked with one of these drives on a PC. PPS: I've got about 2 dozen "nearly new" Teac 1/2 height DD drives in a box in my basement - If anyone needs one, get in touch with me and we can work something out. -- dave13 (at) Dave Dunfield dunfield System/Firmware development services: www.dunfield.com (dot) com Classic computers: http://www.classiccmp.org/dunfield