Re: CDROMEJECT (or START_STOP(2)) completely disables USB flash stick

[Jan Engelhardt <jengelh@linux01.gwdg.de>]

>
>While working on some HAL issues I hit some not clear - to me at least - 
>behavior. I was testing HAL Eject method that under Linux effectively 
>calls 'eject /dev/block'. Now for USB stick - at least, that I have, this 
>results in "ejecting medium" without apparently any way to get it back (the 
>only way is to replug stick).

I suppose eject does the same as `sdparm -C eject`, and yes, it does not 
seem like you can reload an USB stick with the opposite of eject, `sdparm 
-C load` (at least these are the commands that work for CDROM devices).

>{pts/0}% LC_ALL=C sudo blockdev --rereadpt /dev/sda
>/dev/sda: No medium found
>
>I tried 'sdparm -C start' without much success as well:
>
>{pts/0}% LC_ALL=C sudo sdparm -v -C start /dev/sda
>    /dev/sda:           128MB             2.00
>    Start stop unit command: 1b 00 00 00 01 00
>{pts/0}% LC_ALL=C sudo blockdev --rereadpt /dev/sda
>/dev/sda: No medium found
>
>Well, I just try to understand if this is a expected (and reasonable) 
>behaviour or a bug in hardware or possibly software?

I cannot close the tray of the CDROM drive with -C start (or -C ready), so 
I doubt the same will be true for USB sticks.

Maybe all of this is a limitation of USB sticks - I got to check it with 
real USB harddisks or hotswap SCA disks.


Jan Engelhardt
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