Re: usb storage traces

[Matthew Dharm <mdharm-scsi@one-eyed-alien.net>]

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On Thu, Dec 04, 2003 at 03:59:58PM -0500, Alan Stern wrote:
> On Thu, 4 Dec 2003, Matthew Dharm wrote:
> 
> > Did the device advertise 'generic scsi' or one of the other protocol codes?
> > 
> > Microsoft has published information that indicates that they 'translate'
> > the mode-sense commands into the 10-byte variants for everything bug
> > 'transparent scsi' -- I think actually seeing that information would be
> > necessary in constructing a new algorithm for Linux.
> 
> It was generic (transparent) scsi.
> 
> Perhaps I'll try implementing some of the other protocol codes in FSG,
> maybe also the "removeable media" flag.  This would also require
> implementing the PREVENT-ALLOW-MEDIUM-REMOVAL, READ-FORMAT-CAPACITIES, and
> START-STOP, possibly also REZERO-UNIT, SEEK, READ(12), and WRITE(12).
> 
> (1).  Am I missing anything important?

Based on the information I've seen, any one of the other protocol codes
will be fine -- you don't need to do all, just transparent SCSI and one
other.  Of course, all codes would be good for testing.

> (2).  Can I afford to leave out some of those?  The last four don't look 
> very useful.

I agree about the last four.  I can't think of anything else that might be
good to test.

Matt

-- 
Matthew Dharm                              Home: mdharm-usb@one-eyed-alien.net 
Maintainer, Linux USB Mass Storage Driver

G:  Money isn't everything, A.J.
AJ: Who convinced you of that?
G:  The Chief, at my last salary review.
					-- Mike and Greg
User Friendly, 11/3/1998

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