About this mac: Storage is shown weird
OS X Mountain Lion (10.8.5)
First understand what OTHER is:
http://support.apple.com/kb/HT6047
http://pondini.org/OSX/LionStorage.html
Then this may help in dealing with your storage:
http://pondini.org/OSX/DiskSpace.html
Also a good tool to download from the Internet is OmniDiskSweeper (free). Open it and it will show all of your files and the respective sizes. Delete or transfer to an external HDD data you no longer wish to keep on your MBA SSD.
Ciao.
1. Reset PRAM. http://support.apple.com/kb/PH4405
2. Re-index Macintosh HD.
System Preferences > Spotlight > Privacy
About this mac: Storage is shown weird