access to remapped sectors

  • Thread starter Thread starter John Nathan
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J

John Nathan

Is it possible to read sth from sectors that were remapped by disk
controller ??
I know threre is a SCSI command that allow user to know address of remapped
sectors, but what about reading them ???
And what about ATA ?? Is there any command returning a list of remapped
sectors ???

thank you in advance

John
 
Previously John Nathan said:
Is it possible to read sth from sectors that were remapped by disk
controller ??
I know threre is a SCSI command that allow user to know address of remapped
sectors, but what about reading them ???
And what about ATA ?? Is there any command returning a list of remapped
sectors ???
Click to expand...

No general method. Basically you need to find out vendor commands or
hack the firmware. Unless you are prepared to spend a lot of
effort, forget it.

On the other hand, it is likely that professional data recovery
companies can do this.

Why do you ask?

Arno
 
John Nathan said:
Is it possible to read from sectors that were remapped by disk controller ??
I know threre is a SCSI command that allow user to know address of remapped
sectors,
Click to expand...

Yes, but that list is listing physical sectors and there is no way to address physical
sectors, only logical blocks (LBA).

The only way to read a remapped sector is to LLF in such a way that the previously
remapped sector is reinstated as a user addressable logical block. The drive will have
to support a LLF that doesn't initialize the sectors if you want the previous data
and you may have to disable error correction since that data is likely ECC flawed.
but what about reading them ???
And what about ATA ??
Click to expand...

The problem is likely the same as with SCSI.
 
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