I think I know what's going on here, but I'd appreciate if you could
confirm a few issues.

You say

> When using other programs such as Palimpsest (it's the new disk
utility) .. it will eject the volume from the Realtek reader without
issue and it still stays connected to the USB bus.

There are actually three different concepts in palimpsest:

 * If you select a partition of a device, you have the "unmount" button
(second button in toolbar, with the two blue arrows). This doesn't do
any ejecting, and is unproblematic.

 * If you select the device containing the partitions, there are two
buttons: One "eject medium" (third in the toolbar) with a CD eject
symbol (arrow with bar), which calls "eject /dev/sdb"; and one "remove
device from system and power off" (fourth in the toolbar) with a "stop"
symbol (red square) which calls devkit-disks-helper-drive-detach.

I assume that when you wrote the above, you used the third button
(eject), not the fourth one (remove device from system). Can you
confirm?

I assume that devkit-disks-helper-drive-detach is the one which causes
the grief here, and that merely calling "eject" does not cause the
irrevocable USB bus disconnect (you also said so in a comment). So
please confirm again that calling "sudo eject /dev/sdb" works fine.

So we shouldn't detach the drive from nautilus, at least not
unconditionally as we do right now. A compromise might be to not detach
drives which can hold removable media. I'll discuss that with David.

Can you please do

  devkit-disks --dump > /tmp/dk-disks.txt

with the SD card being inserted and mounted, and attach /tmp/dk-
disks.txt here? I'd like to know the particular properties of this
reader.

Thanks!

-- 
dell mini 10v SD/SDHC slot gets ejected from the USB bus on nautilus 'eject' 
https://bugs.launchpad.net/bugs/404185
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