Parallella Community

To be able to see a USB thumb drive on Parallella, add the following to the file: /etc/polkit-1/localauthority/50-local.d/50-mount.pkla

[Mount a system-internal device]
Identity=*
Action=org.freedesktop.udisks2.*
ResultAny=yes
ResultActive=yes
ResultInactive=yes

Make sure your USB thumb drive is formatted as FAT32 or EXT4...
If it's formatted as NTFS, it won't work, at least not yet.

You could also install the Gnome "Disks"tool (with apt-get).

T.