4 ms·

You right. To skip you can pipe tail. sudo head -c 1024 /dev/sda | tail -zc 512 > /tmp/boot.2 Read 1024, keep last 512

• jstimpfle 4y ago
  What if the position is not at 512 but at 512G?
  • fbn79 4y ago
    Not tested, by I think the performance will be in the same order. Would be nice to do a benchmark test.
    • jstimpfle 4y ago
      No, it is O(n) vs O(1). Why would you read 512G + 512 bytes if you only need to read 512 bytes at offset 512G?
      • fbn79 4y ago
        I think you can just invert and do tail first sudo tail -zc +513 /dev/sda | head -c 512 > /tmp/boot.2
        • jstimpfle 4y ago
          Well now you're seeking to the offset (tail is).