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So I'm trying to get a working code in Python that will eject/unmount all USB flash drives attached to the Pi (Running Raspbian) - so that they can be removed safely. The final code will be run from within the python program.

Additionally, I'd like to eject/unmount the USB flash drive even if it's in use.

I've looked around and can't see how to do this. Thanks.

udisks --detach /media/pi/DOCS/ - 'Blocked device... Resource temporarily available'...

udisks --detach /media/pi/ - 'Blocked device...Resource temporarily available'...

udisks --detach /media/ - 'Blocked device...Resource temporarily available'...

sudo udisks --detach /media/pi/DOCS/ - still blocked...

sudo umount /path/to/devicename - command not found...

eject /media/pi/DOCS/ - Unable to open '/dev/sda'

(DOCS is the name if my USB flash drive. - though I want to eject all USB flash drives - not just my one)

So I'm going to ask the user in Python to select their USB flash drive from a list, which is pretty easy (just read in the folder) - so I will have the pathway to the USB. I'm still not sure which code can safely disconnect the USB flash drive - Maybe more research is the answer. Thanks for your help so far.

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  • 1
    What have you tried so far? Edit your post with things you have done. Commented Nov 21, 2017 at 16:37
  • What does this have to do with tkinter? Commented Nov 21, 2017 at 16:49
  • sorry, Nae - nothing really - the button's written in tkinter. I removed the tag. Commented Nov 21, 2017 at 16:53

2 Answers 2

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For udisks --detach the parameter should be the device, not the mounting point. For example, if the USB Disk is /dev/sdb the command would be udisks --detach /dev/sdb

If the command still doesn't work you could try udiskctl power-off -b <device> which should also work.

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Thanks for the answer - so the pathway that appears on my Pi is /media/pi/DOCS - not /dev/sdb. Any idea what path I should use?
@DavidW.Beck /media/pi/DOCS is the Mount pount, but not the device. What Output do you get from mount | grep /media/pi/DOCS?
/dev/sda1 on /media/pi/DOCS type vfat (rw,nosuid,nodev,relatime,uid=1000,gid=1000,fmask=0022,dmask=0077,codepage=437,iocharset=ascii,shortname=mixed,showexec,utf8,flush,errors=remount-ro,uhelper=udisks2)
Okay, so your USB Device is found under /dev/sda. So, for ejecting you should use udisks --detach /dev/sda.
Thanks for your help! Unfortunately, I'm getting 'one or more partitions are busy on /dev/sda' - I think this is the correct command however it's being automated.
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so I found the answer:

sudo eject /dev/sda1

-This disconnects the USB flash drive on a Raspberry Pi.

Thank you very much to everyone who helped!

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