I 'had' a 4GB SD card installed in the internal slot. I noticed the path disappeared from the file manager when I removed the back panel. So I assumed that if it was unmounted then it must be safe to remove with the device on. *wrong*. Fried the bastard. The data that was on it is still readable via my usb flash reader and ubuntu, but is both unwritable and unflashable. lame. For this reason I am afriad to 'remove' my 8GB SD from the 'removable memory card' slot without totally powering down and unplugging the n800 altogether.