Create a recovery USB Drive to free space in your Surface RT

Microsoft has posted an interesting article explaining how you can create a recovery disk in an USB memory stick and after that remove the partition currently located in your Surface. Here is how is done:

Make sure your Surface is plugged in and connected to power.

1. Insert your external USB drive into the USB port on your Surface.
2. Swipe in from the right edge of the screen, and then tap Search.
   (If you're using a mouse, point to the upper-right corner of the screen, move the mouse pointer down, and then click Search.)
3. Enter Recovery in the search box, tap or click Settings, and then tap or click Create a recovery drive.
4. Tap or click Yes in the User Account Control dialog box to allow the recovery drive tool to open.
5. When the recovery drive tool opens, make sure the box is checked next to Copy the recovery partition from the PC to the recovery drive. Then, tap or click Next.
6. Select the USB drive you would like to use for your recovery disk by tapping or clicking on it. Tap or click Next.
7. Tap or click Create. The recovery image and necessary recovery tools will be copied to your USB drive. Your Surface must stay awake during the copy process, which will take 10-15 minutes.
8. When the recovery tools are copied, do one of the following:
   If you want to keep the recovery tools on your Surface, tap or click Finish.
   -Or-
   If you want to remove the recovery tools from Surface and free up disk space, tap or click Delete the recovery partition. To confirm, tap or click Delete. This will free up approximately 3.5 GB of storage space on your Surface. When the removal is complete, tap or click Finish.
   
   Warning  If you choose to delete your recovery partition, you will need your USB recovery drive to refresh or reset your Surface in the future.
    
9. Eject and remove your USB drive. This is now your Surface recovery drive, so keep it in a safe place and do not use it to store other files or data.