Android 4.0.3 File Systems

Android Tutorials - Herong's Tutorial Examples

∟Android 4.0.3 Emulator File Systems

This section describes file systems used by the Android 4.0.3 emulator system. 8 file systems are supported in the Android emulator: /dev, /mnt/asec, /mnt/obb, /system, /data, /cache, /mnt/sdcard, and /mnt/secure/asec.

Like any Unix systems, storage devices are organized as file systems. On the my Android 4.0.3 emulator, I can see the following file systems using the "df" shell command:

C:\local\android-sdk-windows\platform-tools>adb shell
# df
df
Filesystem             Size   Used   Free   Blksize
/dev                   252M    32K   252M   4096
/mnt/asec              252M     0K   252M   4096
/mnt/obb               252M     0K   252M   4096
/system                161M   161M     0K   4096
/data                  124M    13M   110M   4096
/cache                  64M     1M    62M   4096
/mnt/sdcard            126M  1016K   125M   512
/mnt/secure/asec       126M  1016K   125M   512

The "mount" shell command tells me how file systems are mounted from storage devices:

C:\local\android-sdk-windows\platform-tools>adb shell
# mount
mount
rootfs / rootfs ro 0 0
tmpfs /dev tmpfs rw,nosuid,mode=755 0 0
devpts /dev/pts devpts rw,mode=600 0 0
proc /proc proc rw 0 0
sysfs /sys sysfs rw 0 0
none /acct cgroup rw,cpuacct 0 0
tmpfs /mnt/asec tmpfs rw,mode=755,gid=1000 0 0
tmpfs /mnt/obb tmpfs rw,mode=755,gid=1000 0 0
none /dev/cpuctl cgroup rw,cpu 0 0
/dev/block/mtdblock0 /system yaffs2 ro 0 0
/dev/block/mtdblock1 /data yaffs2 rw,nosuid,nodev 0 0
/dev/block/mtdblock2 /cache yaffs2 rw,nosuid,nodev 0 0
/dev/block/vold/179:0 /mnt/sdcard vfat rw,dirsync,nosuid,nodev,noe...
/dev/block/vold/179:0 /mnt/secure/asec vfat rw,dirsync,nosuid,node...
tmpfs /mnt/sdcard/.android_secure tmpfs ro,size=0k,mode=000 0 0