usb storage traces

[Pat LaVarre <p.lavarre@ieee.org>]

> > Tell me we care to hear specifically what
> > some win sends to some of my usb hdd/rmb,
> > and I'll go collect a few sample usb bus
> > traces.
>
> From: Andries.Brouwer@cwi.nl
> Date: Tue, 23 Sep 2003 01:07:59 +0200 (MEST)	
>
> I'll collect and publish.
> (Change the subject line to "USB storage
> traces" or so.)
> Must have some old traces somewhere myself too.

Thank you.

I'm replying before you publish only to confirm we agree we wish to
survey both:
bInterfaceSubClass == x06 TransparentScsi
bInterfaceSubClass != x06 TransparentScsi

as suggested by:

USB Storage FAQ
Updated: May 20, 2003
http://www.microsoft.com/whdc/hwdev/bus/usb/usbfaq.mspx

---

Q: Which device classes does usbstor.sys understand?

In Windows XP, Windows 2000, and Windows Me, usbstor.sys makes only one
distinction:

bInterfaceSubClass == 06h
- OR -
bInterfaceSubClass != 06h

The value bInterfaceSubClass == 06h means that:
Command descriptor blocks (CDBs) should not be padded to 12 bytes.
Mode Sense / Mode Select commands should not be translated from 1AH /
15h to 5AH / 55h.

Subclass 0x06 should generally be used for flash memory devices.

The value bInterfaceSubClass != 06h means that:
CDBs should be padded to 12 bytes.
Mode Sense / Mode Select commands should be translated from 1AH / 15h to
5AH / 55h.

---

Pat LaVarre