On Sunday 28 August 2011 01:42:27 Brett Glass wrote:
> I'm working with a FreeBSD 8.1-RELEASE/amd64 machine that's
> attempting to write data to an ordinary Kingston 8 GB microSD card.
> The card has been inserted into its USB adapter and plugged into a
> USB port on the machine. The system is locking up repeatedly with
> messages that say
> (da1:umass-sim1:1:0:0): SYNCHRONIZE CACHE(10). CDB: 35 0 0 0 0 0 0 0 0 0
> (da1:umass-sim1:1:0:0): SCSI sense: Error code 0x52
> A Web search reveals that problems like this have cropped up for
> many, many FreeBSD users as far back as 4.x. But I can't seem to
> find any solution (which amazes me; if there's a bug, one would
> think it would have gotten some attention). Do I have to abandon
> the use of FreeBSD with USB thumb drives (or maybe with USB
> altogether)? Hope not, but I may have to if I can't get this fixed.
> --Brett Glass


Can try first using:

usbconfig -d X.Y add_quirk UQ_MSC_NO_SYNC_CACHE

Then replug your device.

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