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gringer 10-21-2009 05:30 PM

Ejecting an SD card prevents remounting (eee PC, gnome-mount, Debian system)
I have a small problem with ejecting an SD card on my eee PC (using gnome 'Disk Mounter'). When I eject, the card unmounts, then the visual representation disappears from the screen. So far, so good.

However, if I remove the card, then later want to remount it, I can't. Nothing appears in dmesg to indicate that the card has been noticed, and nothing appears in the taskbar.

When I unmount through nautilis (instead of eject), things work properly (i.e. I can remount a removed, then reinserted card), but the unmount option doesn't appear in the 'Disk Mounter' context menu.

So, I think I need to do one of the two following things:
1) disable eject functionality for SD cards (so unmount is the only available option)
2) stop eject from removing whatever software stuff is needed to recognise the card

A diff of lsmod before and after the remove suggests *something* is happening after the eject, but I can't figure out what:

diff -u modules.txt modules2.txt
--- modules.txt 2009-10-22 11:15:29.378436056 +1300
+++ modules2.txt 2009-10-22 11:15:47.442435947 +1300
@@ -42,17 +42,17 @@
evdev 8028 21
button 5060 0
processor 34560 1
-ext4 197204 2
+ext4 197204 1
mbcache 6924 1 ext4
jbd2 50156 1 ext4
crc16 1760 1 ext4
-sd_mod 28740 4
+sd_mod 28740 2
crc_t10dif 1632 1 sd_mod
ata_generic 4340 0
ide_pci_generic 3632 0
ide_core 87940 1 ide_pci_generic
ahci 30068 0
-usb_storage 48564 1
+usb_storage 48564 0
ata_piix 20848 1
uhci_hcd 19136 0
libata 151044 3 ata_generic,ahci,ata_piix

How can I make the eject process reversible?

business_kid 10-22-2009 04:15 AM

You need unmount before eject.

Try dmesg|tail to see what error it's throwing. Might need a filesystem check, or appear as mounted

gringer 10-22-2009 05:44 AM

The eject command will unmount a mounted disk before ejecting. If the disk can't be unmounted, then the eject won't happen. From the eject man page:

If the device is currently mounted, it is unmounted before ejecting.
and later:

If eject determines that the device can have multiple partitions, it will attempt to unmount all mounted partitions of the device before ejecting. If an unmount fails, the program will not attempt to eject the media.
There are no error messages on dmesg, it seems to eject the SD card fine (as in unmount, I still need to physically remove the card), just ejects a bit too much extra stuff as well. I would like to stop it doing that other stuff (or at least stop allowing 'Disk Mounter' to eject the card).

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