NAND

Example of a NAND chip.

This normally refers to the NAND flash chip used in the iPhone, iPad, iPod Touch, and Apple TV. This is where all the storage capacity comes from. The capacity can range between 4GB, 8GB, 16GB, 32GB, 64GB. Under the iOS standards, it is partitioned into two, the system partition and the user partition. The system partition contains the iOS operating system and the native Apple applications. This is mounted read only. The user partition contains all user data, including installed applications, music, and movies, and is mounted as read/write. A bare-bones jailbreak modifies the "fstab" file in /private/etc and enables read and write on all 2 partitions.