I am using YAFFS2 from the 2.6.32 kernel on an integrated NAND flash device (running android 2.2.1_r1, if that matters). I am seeing 2 odd things, seems like they are related: 1. There are duplicate entries of the same directory (/data/system, below) when I do ls: bash-3.2# mount rootfs on / type rootfs (rw) /dev/root on / type yaffs2 (rw,relatime) tmpfs on /dev type tmpfs (rw,relatime,mode=755) devpts on /dev/pts type devpts (rw,relatime,mode=600) proc on /proc type proc (rw,relatime) sysfs on /sys type sysfs (rw,relatime) tmpfs on /mnt/asec type tmpfs (rw,relatime,mode=755,gid=1000) tmpfs on /mnt/tmpfs type tmpfs (rw,relatime,size=194144k,mode=777,gid=1000) /dev/block/mtdblock7 on /data type yaffs2 (rw,nosuid,nodev,relatime) /dev/block/mtdblock8 on /cache type yaffs2 (rw,nosuid,nodev,relatime) bash-3.2# ls -ailp /data 1 drwxrwx--x 1 1000 1000 2048 Jan 1 2000 ./ 1 drwxrwxr-x 1 0 0 2048 Apr 13 13:50 ../ 511 drwxrwx--x 1 1000 1000 2048 Jan 1 2000 app/ 510 drwxrwx--x 1 1000 1000 2048 Jan 1 2000 app-private/ 441 drwx------ 1 1000 1000 2048 Jan 1 2000 backup/ 264 drwxrwx--x 1 1000 1000 2048 Jul 29 2009 dalvik-cache/ 509 drwxrwx--x 1 1000 1000 2048 Apr 13 16:47 data/ 265 drwxr-x--- 1 0 1007 2048 Jan 1 2000 dontpanic/ 497 drwxrwxrwx 1 1000 1000 2048 Apr 13 16:39 energyhub/ 507 drwxrwx--x 1 2000 2000 2048 Jan 1 2000 local/ 2 drwxrwx--- 1 0 0 2048 Jan 1 2000 lost+found/ 499 drwxrwx--t 1 1000 9998 2048 Jan 1 2000 misc/ 256 drwx------ 1 0 0 2048 Apr 13 16:38 property/ 498 drwxrwxr-x 1 1000 1000 2048 Apr 13 16:47 system/ 498 drwxrwxr-x 1 1000 1000 2048 Apr 13 16:47 system/ 2. My duplicate /data/system inode entry keeps swapping between 506 and 498 when I reboot the device: bash-3.2# date; ls -ailp /data Wed Apr 13 16:46:32 UTC 2011 1 drwxrwx--x 1 1000 1000 2048 Jan 1 2000 . 1 drwxrwxr-x 1 0 0 2048 Apr 13 13:50 .. 511 drwxrwx--x 1 1000 1000 2048 Jan 1 2000 app 510 drwxrwx--x 1 1000 1000 2048 Jan 1 2000 app-private 441 drwx------ 1 1000 1000 2048 Jan 1 2000 backup 264 drwxrwx--x 1 1000 1000 2048 Jul 29 2009 dalvik-cache 509 drwxrwx--x 1 1000 1000 2048 Apr 13 16:46 data 265 drwxr-x--- 1 0 1007 2048 Jan 1 2000 dontpanic 497 drwxrwxrwx 1 1000 1000 2048 Apr 13 16:39 energyhub 507 drwxrwx--x 1 2000 2000 2048 Jan 1 2000 local 2 drwxrwx--- 1 0 0 2048 Jan 1 2000 lost+found 499 drwxrwx--t 1 1000 9998 2048 Jan 1 2000 misc 256 drwx------ 1 0 0 2048 Apr 13 16:38 property 506 drwxrwxr-x 1 1000 1000 2048 Apr 13 16:46 system 506 drwxrwxr-x 1 1000 1000 2048 Apr 13 16:46 system ... Linux version 2.6.32 (mark@eddie) (gcc version 4.3.3 (GCC) ) #2 Wed Mar 30 18:44:20 EDT 2011 ... bash-3.2# date; ls -ailp /data Wed Apr 13 16:47:11 UTC 2011 1 drwxrwx--x 1 1000 1000 2048 Jan 1 2000 . 1 drwxrwxr-x 1 0 0 2048 Apr 13 13:50 .. 511 drwxrwx--x 1 1000 1000 2048 Jan 1 2000 app 510 drwxrwx--x 1 1000 1000 2048 Jan 1 2000 app-private 441 drwx------ 1 1000 1000 2048 Jan 1 2000 backup 264 drwxrwx--x 1 1000 1000 2048 Jul 29 2009 dalvik-cache 509 drwxrwx--x 1 1000 1000 2048 Apr 13 16:46 data 265 drwxr-x--- 1 0 1007 2048 Jan 1 2000 dontpanic 497 drwxrwxrwx 1 1000 1000 2048 Apr 13 16:39 energyhub 507 drwxrwx--x 1 2000 2000 2048 Jan 1 2000 local 2 drwxrwx--- 1 0 0 2048 Jan 1 2000 lost+found 499 drwxrwx--t 1 1000 9998 2048 Jan 1 2000 misc 256 drwx------ 1 0 0 2048 Apr 13 16:38 property 498 drwxrwxr-x 1 1000 1000 2048 Apr 13 16:45 system 498 drwxrwxr-x 1 1000 1000 2048 Apr 13 16:45 system ... ... bash-3.2# date; ls -ailp /data Wed Apr 13 16:55:26 UTC 2011 1 drwxrwx--x 1 1000 1000 2048 Jan 1 2000 ./ 1 drwxrwxr-x 1 0 0 2048 Apr 13 13:50 ../ 511 drwxrwx--x 1 1000 1000 2048 Jan 1 2000 app/ 510 drwxrwx--x 1 1000 1000 2048 Jan 1 2000 app-private/ 441 drwx------ 1 1000 1000 2048 Jan 1 2000 backup/ 264 drwxrwx--x 1 1000 1000 2048 Jul 29 2009 dalvik-cache/ 509 drwxrwx--x 1 1000 1000 2048 Apr 13 16:47 data/ 265 drwxr-x--- 1 0 1007 2048 Jan 1 2000 dontpanic/ 497 drwxrwxrwx 1 1000 1000 2048 Apr 13 16:39 energyhub/ 507 drwxrwx--x 1 2000 2000 2048 Jan 1 2000 local/ 2 drwxrwx--- 1 0 0 2048 Jan 1 2000 lost+found/ 499 drwxrwx--t 1 1000 9998 2048 Jan 1 2000 misc/ 256 drwx------ 1 0 0 2048 Apr 13 16:38 property/ 506 drwxrwxr-x 1 1000 1000 2048 Apr 13 16:46 system/ 506 drwxrwxr-x 1 1000 1000 2048 Apr 13 16:46 system/ ...and so on. And yes, the timestamp did go back in time for the 498 inode version. The device has a battery-backed clock.