On Mon, 9 Oct 2006, Steve Woodford wrote:

>  Log Message:
>  Some removable umass(4) devices don't respond to mode sense page 6, or
>  simply return zero for logical block size. In either case, use the sector
>  length reported by READ_CAPACITY instead of defaulting to 512 bytes.
>
>  This partially addresses the problems reported in PR port-i386/34707 and
>  PR kern/34737. Namely the incorrectly reported drive geometry and the
>  'hanging' issue.

  I had tested using a coworker's iPod Nano, and found that it ignored
a mode sense(10) command (apparently without erroring - it returned
0 bytes of data), but did respond to a mode sense(6) command (although
the page 6 data was all zeroes).  Even more fun was the Sansa c140 I
have - it accepts the mode sense(10) command, but returns the data
in the mode sense(6) format.  This was interpreted as a 600+k sector
length and results in a panic when it attempts to get the disklabel.


--
Michael L. Hitch			mhitch@montana.edu
Computer Consultant
Information Technology Center
Montana State University	Bozeman, MT	USA