hello everybody

MHDD has an option to remap (in scan or repair the surface) bad sectors. It means as far as I know that this option marks bad sectors as unusable and excludes them from usage.

But HDDs' firmware has this option. If a HDD finds a bad sector, it remaps/relocates it to a spare one. HDD's firmware does it.

Does MHDD option do the same? Does it has access to HDD's firmware? Or maybe MHDD does the same as CHKDSK - it marks it as bad in a logical way?


thx

I will read this. But for the time being you did not answer my question. What does remap function in MHDD do?

It just marks bad sector like CHKDSK does? CHKDSK is able to mark bad sectors too.

What Spildit is saying is that the "remap" function in MHDD is a function where MHDD is writing "a pattern" to the sectors on the drive and this in turn triggers the drive's own firmware to do the actual remap operation.

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Hard Disk Drive (HDD), Solid State Drive (SSD, SATA, NVMe, etc), USB Flash Drive and RAID Data Recovery Specialist in Massachusetts

How is it possible to write a pattern to such a sector if it is a bad sector? Bad sector is inaccessible or unwriteable. You mean to write a special tag before such a sector?

To sum up:
1. If CHKDSK finds a bad sector, it marks it as bad. - I guess it is done by writing special tag before a sector. The Read Write Head do not use such a sector. But if we do a quick format the special tag is removed before such a sector and it can be used again.

2. If MHDD finds a bad sector, it marks it as bad. It is done by writing special tag before a sector. HDD's firmware relocates such a sector. This operation is irreversible.

Correct me if I am wrong please.

You are wrong, why you don't read replays.
There is no special tag before every sector.
If you have a copy of original FW you can reverse this process.

And MHDD on option for relocation have note "data will be destroyed" because of writing on sectors.

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Sistrum Data Recovery
http://www.sistrum.mk/en