If you’re a Motorola XOOM owner, take a look at the useful app XDA forum member ekarelis has made to re-mount the microSD card as read/write for rooted Motorola XOOM Honeycomb 3.2 users.
The app simply dismounts and remounts the microSD card in it’s ‘stock’ location as read/write. Optionally, you can also add a mount point to /sdcard/ external which is friendlier for some apps.
Note that the app is still under development so the dev states that use of this app is at your own risk. The app will forcefully dismount/remount the sdcard, so any active access to the sdcard is affected, and under extreme cases can result in data loss.
The dev is adding a lot more error checking, validation to minimise any chances of data loss and also is working on hot-swap sdcard support, remount-on-boot support, and a widget to easily get sdcard status.
For more information, head on over to the application thread._________