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

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