On Thu, Oct 03, 2019 at 07:30:19AM +0200, Pascal Hambourg wrote: [...] > On the contrary. The usb-storage module has a parameter "quirks" > which allows to ignore the write-protect flag for a specific vid:pid > device (I do not remember the exact syntax). I was afraid that it > could be used to by-pass the write-protect switch so I tested it > with my only flash drive with a write-protect switch on. Although > the kernel considered the drive as writable, any write attempt > resulted to an error. Ah, that's interesting... now one could imagine a bug in the flash drive "OS", where it says "no, you can't write me" but accepts and performs write commands... > It is my understanding that Tomas meant that the write-protect > switch does not cut the transmission of the electrical write signal > to the flash memory chips and that the USB mass storage protocol > also includes rejecting write commands, not only advertising the > write-only flag. Thanks, you put my (as usual) babblings into actually intelligible words :-) Cheers -- tomás
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