I used to reboot the phone until the internal SD became available (I run eWallet and need to sync the database on the internal SD of the phone with the one on the PC which fails when the internal SD is not available on the PC). I found out recently that by opening the Device Manager in the System app in the Control Panel on the PC causes the computer to rescan the USB bus which mounts the internal SD. This is less stressful to the Atrix than unplugging the cable and poiwring off and on the phone.