yaffs [master] snapshot from today, linux 2.6.33-rc4 I have patched my kernel with yaffs for testing. I did: flash_eraseall /dev/mtd3 mount -t yaffs /dev/mtdblock3 /mnt/nand cd /mnt/nand touch test cd .. umount nand mount -t yaffs /dev/mtdblock3 /mnt/nand cd nand ls showed no files (except for lost+found). I turned on logging of erase blocks (YAFFS_TRACE_ERASE) and dmesg showed the following: yaffs: dev is 32505859 name is "mtdblock3" rw yaffs: passed flags "" yaffs: yaffs: Attempting MTD mount of 31.3,"mtdblock3" yaffs: auto selecting yaffs2 yaffs: block 2255 is bad yaffs: block 2572 is bad yaffs: block 2574 is bad yaffs: block 3387 is bad yaffs: block 3843 is bad yaffs: block 3845 is bad yaffs: block 4033 is bad yaffs: yaffs_read_super: is_checkpointed 0 yaffs: dev is 32505859 name is "mtdblock3" rw yaffs: passed flags "" yaffs: yaffs: Attempting MTD mount of 31.3,"mtdblock3" yaffs: auto selecting yaffs2 yaffs: block 2255 is bad yaffs: block 2572 is bad yaffs: block 2574 is bad yaffs: block 3387 is bad yaffs: block 3843 is bad yaffs: block 3845 is bad yaffs: block 4033 is bad yaffs: yaffs_read_super: is_checkpointed 0 yaffs: yaffs_block_became_dirty block 1 state 8 yaffs: Erased block 1 Obviously it didn't like the fist block, which I assumed had my file in it, and decided to erase it. What else should I log to try and figure out what is going on? jffs2 on the same partition passes this same test, so I believe the NAND is work okay. Thanks, Nick.