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Ramdisk
This is what iTunes boots to upgrade the firmware and the NOR, and in the case of the iPhone and 3G iPad, it upgrades the Baseband.
It is signed, but if you have administered the Pwnage hack, you can load modified ones.
There are two types of ramdisks. They are very similar, and both are located in the IPSW. There is a Restore Ramdisk and an Update Ramdisk. To decrypt the ramdisks, follow the instructions on the Ramdisk Decryption page.
