I believe this is a regression, as I reported it working correctly on
11.04 in an edit I made to the wiki (https://wiki.ubuntu.com/BootToRAM)
I'm downloading 11.04 and 11.10 to confirm.

>I agree it's perfectly reasonable to keep /isodevice mounted after boot
toram in case the user wants something on there,

No, that's not really good. It's better to clean things up fully. If the
user unplugs and replugs, it'll show up in /media/FS_LABEL
(/media/CORSAIR in my case). This is where the user should expect to
find thumbdrives, not in /isodevice. After booting with toram, the
device should be unmounted so it can be safetly pulled. If the user
wants something on it, they should plug it back in.

>Since yanking the device anyway doesn't cause any problems,

Presumably the filesystem on your thumbdrive is FAT32. Other filesystems
might not be so friendly without a clean unmount, but even FAT32 will be
marked as dirty and request an fsck when next mounted. This can
sometimes interfere with automount systems on various OSs/distros (had
issues with this in the past on both WinXP and freebsd for sure, though
not necessarily related to this bug).

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https://bugs.launchpad.net/bugs/1010176

Title:
  casper toram doesn't free /dev/loop0 after copy

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