Another method of increasing the available space on your hard drive is to delete the unused video versions. Every time you make a purchase of a HD version of a TV show or a movie from the iTunes Store, you should know that the software actually downloads two versions of that video: the high definition (HD) version and the standard definition (SD) version.
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The latter is for those devices that are unable to run high definition videos. Starting with last month, the HD video resolution (720p or 1080p) depends upon on your choice in the iTunes settings as well as if there is a 1080p (full HD) version of that video available. This means that for a standard-length movie it will occupy about 6-7GB on your hard drive, and about 2GB of that capacity is for the SD version while the rest is for its HD counterpart.
Most likely you don’t watch both versions of the video so you can save precious space on your hard drive by deleting the one that you won’t watch. For TV shows you will have to choose the TV Shows list and after that look for those that feature a HD/SD icon to the right of the episode’s name. After selecting an episode you must go to File > Show In Finder and after that erase the version which you don’t want. You’ll have to repeat this process for every episode you have stored. If by any chance in the future you are going to want to re-download this deleted version, you will have to go to the Purchased screen in iTunes and from there click on TV Shows, locate the episode and press the Download button. For movies you have to follow just about the same procedure with the exception that in iTunes you must choose the Movies list. We have to warn you though that because of licensing issues, at the moment you do not have the possibility to re-download movies from Universal and Fox which means that once you delete one of the versions of the movies, this version will be gone forever. If you do a lot of syncing with your iPad, iPhone or iPod Touch, there might be some older backups as well as OS updates that you don’t longer need. To find the backups you must fire up iTunes and from there on go to Preferences and choose the Devices icon which can be found in the window toolbar. There you will get to see a list of all the backups for the iOS devices that you have synced. You can either delete all of the backups or keep the ones which will be of assistance in the future.
There are some third party applications that you might want to use in order to free up space on your hard drive. One example of such software which will help you detect the content which is a candidate for deletion is WhatSize which costs $13. With this app you are able to view the folders and files sorted by size in many ways, and it can also show you the iPhoto and Aperture libraries. Using this app can help you learn which items occupy most of the space on your HDD.