Hi Brian, (Disclaimer - I wrote this years ago: https://www.brutman.com/Diskettes/Diskette_handling.html)
The drive is a DSDD (360) drive. The media is DSDD as well. I've used it for a lot of disk archiving over the years. I might have a speed or timing problem given that I'm using a 386, but Teledisk really shouldn't have a problem with that. It is possible that I have a slight misalignment somewhere, so moving to another PC might work. I want to get it figured out without resorting to Kyroflux or anything esoteric like that. I'm still marveling that it works. The DVI is a wonderfully strange beast. I'm going to need to get a second drive on it because doing disk copies 4 or 8KB at a time is going to get old really fast. :) Mike On Tue, Dec 10, 2024 at 11:06 AM Brian K. White <[email protected]> wrote: > Is the disk a SD/DD media or HD (360K or 1.2M)? > > Is the drive that you used to make the disk a 360K or 1.2M? Maybe the > thinner 80-track head on a HD drive doesn't make a good enough disk vs > the fatter 40-track head on a SD/DD drive. > > Or using a 1.2M drive might be good enough only if the disk is wiped > clean with a bulk eraser (not just erasing/formatting in the drive). To > write a 40-track disk in a 80-track drive, the drive still writes only a > 80-track-thin track and double steps and skips over every other track, > basically writing new data interleaved with old junk. Even if you format > & erase first, there is still at least formatting in between your new > tracks that might not line up so exactly that it doesn't blur the > formatting on your actual data track. > > When the same 80-track drive reads that disk back, it has an 80-track > head and so does not see the neighboring junk tracks, and you get a > clean read. But when a 40-track drive reads that disk, it has a fatter > 40-track head that spans 2 tracks, so it reads junk. > > Even with a bulk eraser to make it so that there is nothing at all > between the new tracks, it's still a thin track making a weaker signal > than the old drive is designed for. > > If you do have both a 360K disk and a 360k drive, you could try just > cloning your own new working disk and see if that works. Maybe the image > Steve posted isn't 100%. I don't know if anyone has yet claimed to > actually use it to reproduce a disk. Even though you can now make copies > with the DVI, it would be good to have a known working downloadable > image too. > > Even you don't have a 360k drive in your dos machine, you DO have a 360k > or 180k drive in your DVI. You could try using that drive in the dos > machine and see how that goes. > > -- > bkw > > On 12/9/24 23:29, Michael Brutman wrote: > > Posting a happy ending ... > > > > Brian hooked me up with one of his cables and boot diskettes and > > everything is working as it should now. > > > > Apparently my 386-40 running Teledisk 2.16 can't create the DVI disk > > image. I was able to make a backup copy of the boot disk directly from > > the Tandy/DVI combo so I'm safe for now, but I'd like to understand why > > Teledisk didn't work when it should have. The only thing that is > > unusual about my system is that I have a Central Point Option Board in > > it, but I've never had that cause a problem before. And the first few > > sectors were fine as the DVI booted from it; it just couldn't continue > > and transfer disk BASIC to the Model 102. > > > > If anybody out there has used Teledisk to create a diskette recently, > > what machine type (XT, AT, ?) did you use and what version of Teledisk > > did you use? > > > > > > -Mike > > > > > -- > bkw >
