cvs commit: src/sys/dev/usb umass.c

Daniel O'Connor doconnor at
Wed Feb 28 02:32:30 UTC 2007

On Wednesday 28 February 2007 09:03, Warner Losh wrote:
>   Create a new quirk READ_CAPACITY_OFFBY1 and add a quirk for the
>   SanDISK ImageMate that I have that suffers from this problem (the
>   SDDR-31).  It intercepts the READ_CAPACITY response and adjusts it
>   from number of sectors to max sector for devices with this quirk.
>   Reading the Linux source suggests that there are a host of
>   other devices with this issue, including iPods and some popular
>   cameras.  I've not added quirks for them, since I don't have the
>   devices in front of me to test.

Couldn't you automatically test for this? ie try and read the last sector.

Obviously if there is a real error in the last sector you'd get a bogus result 
but I don't think that is likely to be very common :)

Daniel O'Connor software and network engineer
for Genesis Software -
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
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