[sllug-members]: fsck and bad sector list

[James Helsby]

In response:
The drive is about 6 months old. There were no physical problems with 
it, nor were there any mechanical / magnetic problems.

What happened, was just like I explained. When fsck saw bad data sectors 
(not bad physical sectors) it wrote those sectors to the bad-block list. 
The ending result was that I lost a shlew of data (corruptions) and the 
sectors the data resided on.

However, I am pleased that after 3 days I was able to figure it out. I 
ended up using a program call HDAT2 in boot mode, to 1) error check the 
physical disk. 2) wipe the physical disk. 3) move the last address (LBA) 
down by 5. 4) move the LBA up by 5. 5) Wipe again

The result, was that the 250 is back sane. Currently formating it with 
helix, and will be putting it back into production in a few minutes.

Saved.

JH.

Don Flemming wrote:
> My first suggestion is to run an anti virus scan off a safe boot 
> disk.There are older binary virus's that specifically rewrite your bad 
> sector table but I haven't heard of anyone encountering these in a few 
> years. Then  ask yourself how old is the harddrive? Maxtors are 
> somewhat known for sudden failures like that and typically after three 
> years. fsck (filesystem check) appears to rebuild your bad sector 
> table, it may simply have found your drive about to die. I look 
> forward to what you find out.
> Don
> */James Helsby <cyanics at xmission.com>/* wrote:
>
>     All,
>
>     I have a 250Gb HD, which was reporting file corruption. As a
>     result, I
>     ran an fsck.ext3 -f -y /dev/sdb1 (the device) on it, which
>     resulted in
>     me loosing 150 of the 250 GB of space. For some reason, the fsck
>     decided
>     that everything was bad-sector, and added it to the bad-sector list.
>
>     Here is the problem. I still need the drive. I know that there are no
>     physical problems with the disk, and it has since be physically
>     scanned
>     for magnetic defects, and low-level formatted. However, both of these
>     actions have not cleared the bad-sector list.
>
>     Anyone on the list know how to clear a bad-sector list? It is a
>     Maxtor
>     DiamondMax 10 (pata133). The system I run it on is Ubuntu 6.10.
>
>     Cheers
>     JH.
>
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