On Mon, Jan 9, 2023 at 12:19 PM Glen Slick via cctalk <cctalk@classiccmp.org> wrote:
> On Mon, Jan 9, 2023, 10:23 AM Warner Losh via cctalk < > cctalk@classiccmp.org> > wrote: > > > On Sun, Jan 8, 2023, 6:29 PM Zane Healy via cctalk < > cctalk@classiccmp.org> > > wrote: > > > > Also, a normal USB Floppy drive can only handle 1.44MB formatted > floppies. > > 720k might work (but there is nothing in the standards to describe this) > > and oddball formats are right out. > > > > Warner > > > > > https://www.usb.org/sites/default/files/usbmass-ufi10.pdf > > USB Mass Storage Class – UFI Command Specification Revision 1.0 > 4.10.2 Formattable Capacity Descriptors > The UFI device supports the following capacity descriptors. > Table 35 - Capacity Descriptors Supported by USB-FDU > DD 720 KB > HD 1.25 MB (1024-byte sectors) > HD 1.44 MB > Indeed... I had a memory of it not doing even the 720k drives, but either I found an old copy of the standard years ago when I was looking at this, or I just misremembered no support for 5.25" floppies at all as only supporting 1.44MB HD format... Thanks for the correction... Warner
