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Revision as of 17:18, 11 August 2014 by IAdam1n (talk | contribs) (Adding to Filesystem category and adding a parents section.)
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It is for iOS System files. It is equivalent to OS X's /System and /Library directories. The size by default is around 1GB iirc. But the size can be changed with redsn0w or sn0wbreeze. It's the smallest partition.