If a drive is hotplugged and CanPowerOff is TRUE, set can_stop to TRUE
With this change, USB-connected drives that appear *during* the user session will now be powered off when the user clicks the "Eject" icon in the GUI. This involves powering off the USB port typically resulting in LEDs and other user-visible features turning off. In particular, bus-powered HDDs will completely turn off by virtue of being, well, bus-powered. This is generally what users expect and should make them feel all cozy, warm inside and, most importantly, more confident removing the device now that the LED is off. Or something. Since we only do this for devices detected *during* the user session, we should not run into problems with internal USB devices such as laptop SD card readers or the various 4-in-1 flash card readers in many workstations. This is actually important because removing the power to the USB port of an "internal" device is generally a bad idea as it requires a system restart to make the laptop BIOS power the ...
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