9 Jan
2023
9 Jan
'23
7:38 p.m.
On Mon, Jan 9, 2023 at 12:19 PM Glen Slick via cctalk <cctalk(a)classiccmp.org>
wrote:
On Mon, Jan 9, 2023, 10:23 AM Warner Losh via cctalk
<
cctalk(a)classiccmp.org>
wrote:
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
On Sun, Jan 8, 2023, 6:29 PM Zane Healy via
cctalk <
cctalk(a)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