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Linux users are also familiar with partitions versus directories. Some directories visible via the file manager (or ls command on linux) may be mounted partitions. A good article reference to read is: [http://www.addictivetips.com/mobile/android-partitions-explained-boot-system-recovery-data-cache-misc/ Android Partitions Explained: boot, system, recovery, data, cache & misc] by an author named By Haroon Q. Raja.