USB Permissions for Virtualbox

Edit:
sudo nano /etc/udev/rules.d/40-permissions.rules

Change:
# USB devices
SUBSYSTEM=="usb_device", MODE="664"

To:

SUBSYSTEM=="usb_device", MODE="666"

from http://ubuntuforums.org/archive/index.php/t-393582.html

USB SD / SDHC card reader not mounting

From http://www.omg.unb.ca/~steveb/linux_tweaking.html

It's an fstab problem:

-You can mount the drive manually as root using the command 'mount /dev/sda1 /mnt/usb_drive' where /mnt/usb_drive has been created before hand.
-That will only allow root write access.

-Adding the line '/dev/sda1 /mnt/usb_drive auto user 0 0' to the fstab file will allow users to mount and umount the drive and have write access.