Author: James Courtier-Dutton Date: To: Hampshire LUG Discussion List Subject: Re: [Hampshire] ext4 and dd disc cloning
On 10 July 2010 11:39, John Cooper <lug@???> wrote: >
> b = (int)((L-S)*512/B)
> where:
> b = File System block number
> B = File system block size in bytes
> L = LBA of bad sector
> S = Starting sector of partition as shown by fdisk -lu
> and (int) denotes the integer part.
>
> L=572267884, S=401625 B=4096
> b=(572267884-401625)x512/4096=71483282
>
>
> So will repeat process to fix 572267884.
>
Do not repeat the process. It just causes more damage.
The HD has failed.
Use "ddrescue" instead of "dd" to backup as much as you can, if you
don't already have a backup.
All ddrescue does is ignore the errors and copies the rest.
That hard drive is very ill. It should be doing automatic reallocation
of sectors but it is doing nothing.
In smartctl -a, what model of HD is it. It has a really bad BIOS.
