USB flash drive oddity

Steve O'Hara-Smith steve at
Thu Apr 5 23:41:59 PDT 2007

On Wed, 4 Apr 2007 11:36:20 -0700 (PDT)
Matthew Dillon <dillon at> wrote:

>     I dunno about the tag mismatch, but the cache synchronization failure
>     is due to many UMASS USB devices not implementing that command, and
> the USB spec is such that unimplemented commands can cause device timeouts
>     and require a reset (basically due to horrible decisions made
>     by the idiots who designed the USB spec).

	This (coupled with the fact that Windows never seems to suffer this
problem) prompts me to wonder if Windows simply never uses the cache
syncronisation feature and indeed if any umass devices actually require it
to be used. Disabling it seems to be by far the most common quirk entry.
Might we get more reliable umass behaviour by making not using it the
default ?

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