[wellylug] RE: Copying from USB stick in Redhat server

[John Durham]

Peter Dawson wrote:
>>>> Sometimes with SCSI devices you need to use eject as well
>>>>
>>>> eject /dev/sda
>>>>
> 8><=== snip...
> 
>> I've never heard of needing to use eject on a USB stick before - you did make sure that the > umount command had finished didn't you? It will return you to a prompt once complete.
>>
>> Sometimes it takes a few seconds to complete, as it has to write the cache to the disk
>> before it can umount the filesystem - if you were to pull it out whilst this was happening,
>> you'd get the errors.
> 
> I recently saw a comment somewhere that mentioned that some USB devices seem to be programmed to expect a particular command sequence to disconnect properly, specifically one emitted by Windows (Cameras & mp3 players spring to mind), and these devices complained about not having been correctly removed from the PC without that sequence.
> 
> I gathered also that 'eject' supplies that command sequence before actually 'unmount'ing the device.
> 
> Personally, I have taken to using eject rather than umount when an intelligent device is being disconnected. It doesn't appear to have caused any problems yet... YMMV
> 
> Cheers, Phreadde :-)

That may be worth remembering (standards with variations upon variations).

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