Android File Systems
Android in most mobile phones up to version 2.2 (Froyo) use the YAFFS2 filesystem.
Here is some information about YAFFS2:
- File Systems#YAFFS2
- Wookey's presentation about YAFFS at ELC Europe 2007 yaffs.pdf, video
- YAFFS update for ELC Europe 2010
According to this report by Ted Tso, version 2.3 (Gingerbread) will be using ext4