How to resolve dd error reading?

Question

I have dd error reading

# sudo dd if=/dev/sda1 of=backup.img bs=4M status=progress
16478679040 bytes (16 GB, 15 GiB) copied, 154 s, 107 MB/s
dd: error reading '/dev/sda1': Input/output error
3928+1 records in
3928+1 records out
16478679040 bytes (16 GB, 15 GiB) copied, 156.816 s, 105 MB/s

I thought this probably means disk has bad blocks. I ran

# e2fsck -cfpv -C 0 /dev/sda1
/dev/sda1: Updating bad block inode.
  700895 inodes used (3.66%, out of 19144704)
    2596 non-contiguous files (0.4%)
    1226 non-contiguous directories (0.2%)
         # of inodes with ind/dind/tind blocks: 0/0/0
         Extent depth histogram: 638434/974/3
 9995951 blocks used (13.05%, out of 76571648)
       1 bad block
       3 large files

  515535 regular files
  117354 directories
      57 character device files
      26 block device files
       0 fifos
     284 links
   67853 symbolic links (61332 fast symbolic links)
      61 sockets


  701170 files

It apparently fixed not what important for dd. How to fix what is needed?

Does this answer your question? How to disk copy with unreadable sectors? — Kamil Maciorowski, May 27 '23 at 07:50
Your dd command copies the block device’s contents. It doesn’t know or care about the file system, so the bad block inode there is of no use to it. — Stephen Kitt, May 27 '23 at 08:59

How to resolve dd error reading?

0 Answers0