2

I have:

  1. Broken 32GB micro SD card - cannot write anything to it despite trying to force with (hdparm -r0 /dev/sdc):

    EXT4-fs (sdc1): mounting ext3 file system using the ext4 subsystem
EXT4-fs (sdc1): INFO: recovery required on read-only filesystem
EXT4-fs (sdc1): write access unavailable, cannot proceed

  2. New 32GB micro SD card

If I try to dd whole /dev/sdc to file:

sudo umount /dev/sdc*
sudo dd if=/dev/sdc of=/hhome/os.img bs=4k

and put it back :

sudo dd if=/hhome/os.img of=/dev/sdc bs=4k

I get:

sdc: unknown partition table

while "broken sd" consists good partition table.

Whats wrong?

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2
  • Can clonezilla clone it?
    – ivanivan
    Commented May 7, 2017 at 15:57
  • Did you format the "new sd card"?
    – George Udosen
    Commented May 7, 2017 at 16:33

1 Answer 1

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0

Your dd command will stop as soon as it finds a bad cluster. Use ddrescue or gddrescue instead, and don't forget to use a log file with it.

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  • 1
    The error seems to come from the umount command. dd doesn't care about partition tables. It only sees bytes.
    – gronostaj
    Commented Dec 23, 2020 at 6:24

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