On Thu, 8 Nov 2012, Jason J. Herne wrote:

> On Thu, Nov 8, 2012 at 11:23 AM, Alan Stern <[email protected]> wrote:
> > I don't know how the ATA layer in Linux works.  You'll have to ask
> > someone else or figure it out yourself.
> >
> >> I know we get to sd_prep_fn even when the drive in connected directly
> >> via Sata, just not
> >> sure which READ is used. I could find this out with a simple test.
> >
> > It's not just a question of which command sd_prep_fn generates; it's
> > also a question of what command ultimately gets sent to the drive.
> > They aren't necessarily the same.
> >
> 
> Alan,
> 
> Thank you very much for all your help with this.
> Do you have any thoughts on where I should take this next?
> I noticed that a usb-storage list exists. Perhaps there?

No.  You shouldn't think of this as a USB problem any more; you should 
consider it a SCSI/ATA problem.  Try asking the people on the 
linux-scsi and linux-ide mailing lists.  But keep linux-usb in the CC: 
list just in case.

Alan Stern

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