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I've rooted my device, put it in recovery mode, and have linked it to PC by adb shell.

How can I view the list of storage devices and partitions?

Note: fdisk doesn't work.

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fdisk works if you pass it a device like fdisk -l /dev/block/mmcblk0 –  endolith Oct 4 '14 at 17:21

4 Answers 4

up vote 5 down vote accepted

I believe you want: cat /proc/mtd.

Also useful: mount.

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cat /proc/partitions shows a list of all the partitions too. I think mount correlates with cat /proc/mounts. Ah, good 'ol /proc –  Ehtesh Choudhury Jul 18 '13 at 11:35
    
all I get is dev: size erasesize name whether I run as su or not. android.stackexchange.com/q/53225/693 –  endolith Sep 28 '13 at 14:17
    
/proc/mtd is not available on all devices, while /proc/partitions should be. –  Izzy Jul 20 at 16:33

Even more useful information can be obtained from parted. An example when the block device is /dev/block/mmcblk0:

~ # parted /dev/block/mmcblk0 print
Model: MMC SEM04G (sd/mmc)
Disk /dev/block/mmcblk0: 3959MB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start   End     Size    File system  Name       Flags
10      524kB   1573kB  1049kB               PIT
 6      1573kB  3146kB  1573kB               CSPSA FS
 7      4194kB  14.7MB  10.5MB  ext4         EFS
 2      14.7MB  31.5MB  16.8MB  ext4         Modem FS
14      32.5MB  34.6MB  2097kB               SBL
16      34.6MB  36.7MB  2097kB               SBL_2
 1      36.7MB  53.5MB  16.8MB               PARAM
12      53.5MB  55.6MB  2097kB               IPL Modem
13      55.6MB  72.4MB  16.8MB               Modem
15      72.4MB  89.1MB  16.8MB               Kernel
17      89.1MB  106MB   16.8MB               Kernel2
 3      106MB   748MB   642MB   ext4         SYSTEM
 5      748MB   2056MB  1309MB  ext4         DATAFS
 4      2056MB  2377MB  321MB   ext4         CACHEFS
 9      2377MB  2713MB  336MB   ext4         HIDDEN
11      2713MB  2765MB  52.4MB               Fota
 8      2765MB  3949MB  1184MB               UMS

~ #
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You can see sizes and usage statistics of all mounted partitions by simply using this command:

df

Note, the typical df -h does not work here and is not needed because the output is already in megabytes. The command works within adb shell and the Android terminal emulator, but not in the Recovery mode terminal because nothing is mounted at that point.

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I usually use a combination of the following 4 commands and correlate them, since each of these commands gives a piece of the information that might be needed.

Summarily:

  1. Using df lists the filesystem path alias and size info as seen below (total size, used, free and block size)

    • Example output:
      root@ks01lte:/sdcard # df df Filesystem Size Used Free Blksize /dev 910.0M 92.0K 909.9M 4.0K /firmware 64.0M 8.7M 55.2M 16.0K /firmware-modem 64.0M 49.2M 14.8M 16.0K /system 2.2G 2.2G 62.7M 4.0K /data 11.9G 3.0G 8.9G 4.0K /cache 31.5M 4.1M 27.4M 4.0K /persist 7.9M 4.0M 3.8M 4.0K /efs 13.8M 4.4M 9.3M 4.0K /storage/emulated 910.0M 0.0K 910.0M 4.0K /storage/emulated/0 11.9G 3.0G 8.9G 4.0K /storage/emulated/0/Android/obb 11.9G 3.0G 8.9G 4.0K /storage/emulated/legacy 11.9G 3.0G 8.9G 4.0K /storage/emulated/legacy/Android/obb 11.9G 3.0G 8.9G 4.0K /mnt/media_rw/extSdCard 29.7G 251.8M 29.5G 32.0K /storage/extSdCard 29.7G 251.8M 29.5G 32.0K
      (... cut for space reasons)
  2. Using cat /proc/mountsshows the partition file path, the alias, the filesystem type, the startnig inode, the number of blocks, read/write status (and other parameters of the individual partition that i'm not entirely sure of)

    • NB: The output of cat /proc/mounts can be a bit messy, but if you read it line by line (entry by entry) carefully you'll get the info
    • Example output:
      root@ks01lte:/sdcard # cat /proc/mounts cat /proc/mounts rootfs / rootfs ro,relatime 0 0 tmpfs /dev tmpfs rw,seclabel,nosuid,relatime,size=931840k,nr_inodes=124673,mode=755 0 0 devpts /dev/pts devpts rw,seclabel,relatime,mode=600 0 0 none /dev/cpuctl cgroup rw,relatime,cpu 0 0 proc /proc proc rw,relatime 0 0 sysfs /sys sysfs rw,seclabel,relatime 0 0 selinuxfs /sys/fs/selinux selinuxfs rw,relatime 0 0 debugfs /sys/kernel/debug debugfs rw,relatime 0 0 none /sys/fs/cgroup tmpfs rw,seclabel,relatime,size=931840k,nr_inodes=124673,mode=750,gid=1000 0 0 /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,nodev,noatime,discard,journal_checksum,journal_async_commit,noauto_da_al loc,data=ordered 0 0 /dev/block/platform/msm_sdcc.1/by-name/cache /cache ext4 rw,seclabel,nosuid,nodev,noatime,discard,journal_checksum,journal_async_commit,noauto_da_allo c,errors=panic,data=ordered 0 0 /dev/block/platform/msm_sdcc.1/by-name/persist /persist ext4 rw,seclabel,nosuid,nodev,noatime,discard,journal_checksum,journal_async_commit,noauto_da_ alloc,data=ordered 0 0 /dev/block/platform/msm_sdcc.1/by-name/efs /efs ext4 rw,seclabel,nosuid,nodev,noatime,discard,journal_checksum,journal_async_commit,noauto_da_alloc,da ta=ordered 0 0
      (... cut for space reasons)
  3. Using cat /proc/partitions you will get the actual partition name identifier and the number of blocks in the partition.

    • Example output:
      root@ks01lte:/sdcard # cat /proc/partitions cat /proc/partitions major minor #blocks name 253 0 1048576 vnswap0 179 0 15388672 mmcblk0 179 1 15360 mmcblk0p1 179 2 58816 mmcblk0p2 179 3 512 mmcblk0p3 179 4 32 mmcblk0p4 179 5 32 mmcblk0p5 179 6 2048 mmcblk0p6 179 7 512 mmcblk0p7 179 8 512 mmcblk0p8 179 9 10240 mmcblk0p9 179 10 10240 mmcblk0p10 179 11 14336 mmcblk0p11 179 12 3072 mmcblk0p12 179 13 3072 mmcblk0p13 179 14 20480 mmcblk0p14 179 15 20480 mmcblk0p15 179 16 10240 mmcblk0p16 179 17 7159 mmcblk0p17 179 18 3072 mmcblk0p18
      (... cut for space reasons)
  4. Using ls -al /dev/block/platform/msm_sdcc.1/by-name you get the mapping between the partition alias and the path of actual partition file (you also get the owner, their user group, etc)

    • Example output:
      root@ks01lte:/sdcard # ls -al /dev/block/platform/msm_sdcc.1/by-name ls -al /dev/block/platform/msm_sdcc.1/by-name lrwxrwxrwx root root 2014-01-20 11:29 aboot -> /dev/block/mmcblk0p6 lrwxrwxrwx root root 2014-01-20 11:29 apnhlos -> /dev/block/mmcblk0p1 lrwxrwxrwx root root 2014-01-20 11:29 backup -> /dev/block/mmcblk0p17 lrwxrwxrwx root root 2014-01-20 11:29 boot -> /dev/block/mmcblk0p14 lrwxrwxrwx root root 2014-01-20 11:29 hidden -> /dev/block/mmcblk0p25 lrwxrwxrwx root root 2014-01-20 11:29 modem -> /dev/block/mmcblk0p2 lrwxrwxrwx root root 2014-01-20 11:29 persdata -> /dev/block/mmcblk0p22 lrwxrwxrwx root root 2014-01-20 11:29 persist -> /dev/block/mmcblk0p21 lrwxrwxrwx root root 2014-01-20 11:29 recovery -> /dev/block/mmcblk0p15 lrwxrwxrwx root root 2014-01-20 11:29 system -> /dev/block/mmcblk0p23 lrwxrwxrwx root root 2014-01-20 11:29 tz -> /dev/block/mmcblk0p8 lrwxrwxrwx root root 2014-01-20 11:29 userdata -> /dev/block/mmcblk0p26
      (... cut for space reasons)
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