To see what it does - USB drives control formatting themselves, so this should do the right thing if it supports double-density disks. It is still worth trying a plain format a: There are some USB drives which support double-density disks and formats, but as you suspect, not all of them. Invalid media or Track 0 bad - disk unusable. On Stephen Kitt's suggestion, I tried a standard "format a:" but it didn't work. But it was highly rated on Amazon and some people even said they used this exact drive to format 720K. Is this possible or am I going to have to do something else? I plan on swapping my Tandy 1000 EX's 5.25" drive with a 3.5" version and I'd like to transfer images over that way (sneaker-net). It's also the disk that only has the one hole. The disk I'm using should be good but I cannot completely confirm. Just like the message said, the format failed. When I did that, here is what I got: format a: /f:720 One instance said to use the following command at the DOS prompt: format a: /f:720 Even with Windows 10 (which is what I'm using).
But then I read several posts online where people say they have done it. Here's how to tell the difference on 5.25" disks.I've read many times that USB floppy drives will not format (or read/write) 720K disks.
Here's how to tell the difference on 3.5" disks. When formatted for IBM, the disks are 360K. When used in connection with 5.25 inch floppy disks, the disk are 500K before the disk is formatted. When formatted for IBM, the disks are 720K. When used in connection with 3.5 inch floppy diskettes, the disk capacity is 1MB before the disk is formatted. Sometimes called MF2-DD or low density disks. DS/DD or MF2-DD "low density": The term DS/DD means double sided double density. When formatted for IBM, the disks are 1.2 MB. When used in connection with 5.25 inch floppy disks, the disk capacity is 1.4 MB before the disk is formatted. When formatted for IBM, the disks are 1.44 MB. When used in connection with 3.5 inch floppy diskettes, the disk capacity is 2.0 MB before the disk is formatted. DS/HD or MF2-HD "high density": The term DS/HD means double sided high density. We offer a wide variety of DS/HD and DS/DD floppy disks.
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