linux-kernel - Re: Checking a USB drive's capacity

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Message-ID: <20081221144503.16919dc1@lxorguk.ukuu.org.uk>
Date:	Sun, 21 Dec 2008 14:45:03 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Jens Axboe <axboe@...nel.dk>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: Checking a USB drive's capacity

On Thu, 18 Dec 2008 23:33:09 -0500 (EST)
Alan Stern <stern@...land.harvard.edu> wrote:

> On Thu, 18 Dec 2008, Alan Cox wrote:
> 
> > > spun up yet.  Not to mention that it seems strange to read the last
> > > sector before reading the first!
> > 
> > The SCSI CD code deals with this by spotting the error is close to the
> > end and of particular types then interpreting it and adjusting the volume
> > size. This is done because the size value for a CD-R/RW is imprecise.
> 
> Although it may be okay for CDs, I suspect that approach won't work for 
> disks.

Some of the partition formats do indeed go looking for the end of disk so
it won't work in that case.
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