Hello,

I'm using KDE 4.12.4 on Arch.

I've noticed that there are some USB removable storage devices which are completely gone after a umount (aka removed from "Geräteüberwachung" within the systray) and thus cannot be mounted again (without unplugging and pluggin in again) while others persist in the devices list and can be mounted again.

Is there any logic to that? (USB flash drives are removed, USB hard drives stay?) If this behaviour is intentional, why is it done that way?

Regards ....

This is part of the "eject" logic I believe - which is handled purely by UDisks. When a device is seen as easily removable (as a flash drive is) then when it is unmounted it is also ejected if possible, which ensures the device can be immediately disconnected.

For a USB hard drive though, it is seen as fixed, and so therefore isn't ejected, allowing for it to be more easily reused at the risk of data not being fully flushed to the drive.