On Wed, 23 Jun 2004, Michal Purzynski wrote:

> hello again
> 
> this time (and last time :) problems with usb pendrive. it has write lock
> switch, that is autodetected in 2.4 kernel, resulting with message saying,
> that device is read-only. any futher writes to it are rejected without
> problem. but in 2.6 it is not detected, so kernel does not know that write
> is impossible, what leads to mesages as shown below:

> to me, it should detect read-only switch and behave in sane way as 2.4 was.
> 
> Albeiro

The ability to do this was just added back into 2.6.  It may not have 
appeared in the distribution kernels yet, but it will.  It's a kernel 
configuration option under usb-storage labelled

        USB Mass Storage Write-Protected Media Detection (EXPERIMENTAL)

You won't see it unless you have selected the Experimental option in the
Code Maturity Level section.

The facility was removed from 2.6 for a long time because it kept causing 
a lot of problems with certain drives.  Hopefully it's working better now.

Alan Stern



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