What is Android s file system

Question

User · Answer

since most of the devices use eMMC the file system android uses is ext4 except for the firmware refer-http   android-developers blogspot com 2010 12 saving-data-safely html  Here is the filesystem on galaxy s4     system ext4  data ext4  cache ext4  firmware vfat  data media  mnt shell emulated sdcardfs   The detailed output is as follows       dev block platform msm sdcc 1 by-name system  system ext4   ro seclabel relatime  data ordered 0 0       dev block platform msm sdcc 1 by-name userdata  data ext4   rw seclabel nosuid no   dev noatime discard journal checksum journal async commit noauto da alloc data o   rdered 0 0       dev block platform msm sdcc 1 by-name cache  cache ext4   rw seclabel nosuid node   v noatime discard journal checksum journal async commit noauto da alloc data ord   ered 0 0       dev block platform msm sdcc 1 by-name efs  efs ext4   rw seclabel nosuid nodev no   atime discard journal checksum journal async commit noauto da alloc errors panic    data ordered 0 0       dev block platform msm sdcc 1 by-name persdata  persdata absolute   ext4 rw secla bel nosuid nodev relatime data ordered 0 0       dev block platform msm sdcc 1 by-name apnhlos  firmware vfat   ro context u objec   t r firmware s0 relatime uid 1000 gid 1000 fmask 0337 dmask 0227 codepage cp437    iocharset iso8859-1 shortname lower errors remount-ro 0 0       dev block platform msm sdcc 1 by-name mdm  firmware-mdm vfat   ro context u objec   t r firmware s0 relatime uid 1000 gid 1000 fmask 0337 dmask 0227 codepage cp437    iocharset iso8859-1 shortname lower errors remount-ro 0 0       data media  mnt shell emulated sdcardfs   rw nosuid nodev relatime uid 1023 gid 1 023 0 0

User · Answer

Similar to Linux     boot  system  recovery  data  cache  misc

User · Answer

Android supports all filesystems supported by the Linux kernel  except for a few ported ones like NTFS  The SD card is formatted as ext3  for example

User · Answer

It depends on what filesystem  for example  system and  data are yaffs2 while  sdcard is vfat  This is the output of mount    rootfs   rootfs ro 0 0 tmpfs  dev tmpfs rw 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 tmpfs  sqlite stmt journals tmpfs rw size 4096k 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  sdcard vfat rw dirsync nosuid nodev noexec uid 1000 gid 1015 fmask 0702 dmask 0702 allow utime 0020 codepage cp437 iocharset iso8859-1 shortname mixed utf8 errors remount-ro 0 0   and with respect to other filesystems supported  this is the list  nodev   sysfs nodev   rootfs nodev   bdev nodev   proc nodev   cgroup nodev   binfmt misc nodev   sockfs nodev   pipefs nodev   anon inodefs nodev   tmpfs nodev   inotifyfs nodev   devpts nodev   ramfs          vfat          msdos nodev   nfsd nodev   smbfs          yaffs          yaffs2 nodev   rpc pipefs

User · Answer

Most answers here are pretty old   In the past when un managed nand was the most popular storage technology  yaffs2 was the most common file system  This days there are few devices using un-managed nand  and those still in use are slowly migrating to ubifs   Today most common storage is emmc  managed nand   for such devices ext4 is far more popular  but  this file system is slowly clears its way for f2fs  flash friendly fs    Edit  f2fs will probably won t make it as the common fs for flash devices  including android

User · Answer

By default  it uses YAFFS - Yet Another Flash File System

User · Answer

When analysing a Galaxy Ace 2 2 in a hex editor  The hex seemed to point to the device using FAT16 as its file system  I thought this unusual  However Fat 16 is compatible with the Linux kernel

User · Answer

Johan is close - it depends on the hardware manufacturer   For example  Samsung Galaxy S phones uses Samsung RFS  proprietary    However  the Nexus S  also made by Samsung  with Android 2 3 uses Ext4  presumably because Google told them to - the Nexus S is the current Google experience phone    Many community developers have also started moving to Ext4 because of this shift

User · Answer

Depends on what hardware platform you use    Since Android uses the Linux-kernel at this level  it is more or less possible to use whatever filesystem the Linux-kernel supports   But since most phones use some kind of nand flash  it is safe to assume that they use YAFFS   But please note that if some vendor wants to sell a Android netbook  with a harddrive   they could use ext3 or something like that

[android] What is Android's file system?

Examples related to android

Examples related to filesystems