I cannot see a regression here: In up-to-date Jaunty (supported updates,
at least), the "safely remove" option that I see in desktop and nautilus
sidebar is actually called "Unmount" and it does the same as Unmount
does in Karmic: it unmounts the filesystem.

Unmounting the filesystem does not prevent raw blockdevice access (e.g.,
fdisk or dd), as opposed to Eject and Safely Remove, which actually turn
off all access to the media. Therefore, these options are safer that
unmounting (although calling these before a dd has ended will kill dd
and could corrupt the data in any case).

In addition, "safely remove" shutdowns the device so that it has to be
reconnected to use it again (as computx notes, it is not a question of
modules or services that could be reloaded without physical reboot
AFAIK). This avoids electric transients, which could eventually damage
the microchips (even those designed for hotplug). Despite the fact that
this is not a very common issue, it is a progress that Ubuntu is
implementing this, that they do "more" than unmounting.

-- 
sd card "safely remove drive" kills reader device
https://bugs.launchpad.net/bugs/504440
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