I can confirm a couple of things.
1. Problem is related to some external controller / USB chip combinations.
2. AFAIK, this happens due to emulated SCSI bus being stalled by too many
sectors being transmitted in a turn.
My setup is an AT2+ (68030) enclosure by Cypress with an old 20 GB
harddisk. The box being connected to NForce3 USB chip is very unstable,
errors occur only when writing. The same box when connected to add-in
USB card with NEC chip (Adaptec clone) is a l m o s t stable. Errors
occur only when system is overloaded, probably due to a different bug.
More to that, same box performs well under Windows, no matter what USB
chip it's connected to.
Changing max_sectors to 128 resolves bug for me.
As it was written above, you may create an udev rule. But as Scott
James Remnant put this:
BUS=="scsi", SYSFS{vendor}=="RockChip", RUN+="/bin/sh -c '/bin/echo 128
> /sys/block/%k/device/max_sectors'"
it won't work. You are dealing with SCSI device now, not USB ATA
controller device!
So it should look like:
BUS=="scsi", SYSFS{vendor}=="MAXTOR", RUN+="/bin/sh -c '/bin/echo 128 >
/sys/block/%k/device/max_sectors'"
for example, if you're using MAXTOR drive.
--
USB mass storage stops working after a while
https://bugs.launchpad.net/bugs/61235
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