Where's my data?

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http://androidforums.com – I am tri-booting Android, Web OS, and Arch Linux on my HP touchpad. When I booted into Web OS it told me my storage space was low. Somehow I had partitioned something wrong since now I have only 5 gigabytes of storage space. I thought I may have allocated too much memory to Arch Linux but when I checked the partitions only 4 gigabytes was allocated to Arch Linux and 21 gigabytes to the media partition. Anyone know what happened to the 17 gigabytes of data? I don't see any unformated partitions. I have attached a picture of the partition tables and the HP touchpad in My Computer. (General)