YAFFS. Yaffs (Yet Another Flash File System) was designed and written by Charles Manning, of Whitecliffs, New Zealand, for the company Aleph One.
Yaffs1 was the first version of this file system and was designed for the then-current NAND chips with 512 byte page size (+ 16 byte spare (OOB;Out-Of-Band) area). Work started in 2002, and it was first released later that year. The initial work was sponsored by Toby Churchill Ltd, and Brightstar Engineering. These older chips also generally allow 2 or 3 write cycles per page,[clarification needed] which YAFFS takes advantage of - i.e. dirty pages are marked by writing to a specific spare area byte.
Newer NAND flash chips have larger pages, first 2K pages (+ 64 bytes OOB), later 4K, with stricter write requirements. Nandroid v2.0 - Full NAND backup and restore tool (tried and tested!) Nandroid v2.0 - Full NAND backup and restore tool (tried and tested!)
* What is Nandroid Backup v2.0? Nandroid Backup is a set of tools and a script that will enable anyone who has root on their G1 and has the engineering/dev spl bootloader [1] (or has a dev phone) + a recovery image with busybox and adbd running as root [2] to make full system backups. These can then be restored using the fastboot [3] commandline tool and your phone in SPL/bootloader mode (hold camera + power). This allows you to create regular backups of your entire phones NAND flash so that you can restore a backup when something breaks. Its backup method works on a level that allows you to completely break, wipe or corrupt any or all partitions and still restore the phone to a working state within a few minutes.