I am finally able to install CWM on my asus. I suspected the asus didn't do well and there could be too many bad blocks on it's NAND.

So Now that I can do fast boot and recovery and adb, I think I would scan the whole NAND memory and see if something is bad and then mark it.

You know, like chkdsk or fdisk

How would I do so?

  • Have you tried fsck in ADB while in recovery mode? It might not work, but then it might. Feb 16, 2016 at 16:56
  • Also, the whole of the NAND is not available to ADB even in recovery. The modem and bootloader partitions are protected, for example. Fastboot doesn't have anything like fsck, and it is the only mode in which these protected partitions are accessible. Feb 16, 2016 at 16:58
  • Maybe try using the block device id of the NAND from fdisk for fsck? Feb 16, 2016 at 16:59

1 Answer 1


You can follow these steps to check your Android NAND chip partition which checks bad blocks:

1.for your data safety,backup your data to pc or cloud first.

2.boot to recovery.

3.unmount all partition in recovery.

4.connect your phone to pc.

5.execute adb shell .

6.use cd command go to your partition directory,usual in:

/dev/block/platform/soc.0/<chip ID>/by-name

or like:


for example:

cd /dev/block/platform/soc.0/12345678.sdhci/by-name

after enter directory,you can execute ls command show all partition name,like system,cache,userdata,etc.

7.execute e2fsck command with -cfv parameter and partition name,for example,you want check userdata ( /data ) partition with check bad blocks:

e2fsck -cfv userdata

or system partition:

e2fsck -cfv system

Additional Information:

The -c parameter for e2fsck is check for bad blocks and add them to the badblock list, you can execute e2fsck -h get more information.

  • -c doesn't work on android, badblocks not found
    – endolith
    Aug 24, 2021 at 11:38

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