Re: Driver retries disk errors.

[Andre Hedrick]

Rogier,

Because the command layer states to execute retries, regardless.
Modern drives now convert read-once to retry.
You need special opcodes to revert to desired status.

Media forensics is not a cake walk.

Andre Hedrick
LAD Storage Consulting Group

On Tue, 31 Aug 2004, Alan Cox wrote:

> On Llu, 2004-08-30 at 17:39, Rogier Wolff wrote:
> > We encounter "bad" drives with quite a lot more regularity than other
> > people (look at the Email address). We're however, wondering why the
> > IDE code still retries a bad block 8 times? By the time the drive
> > reports "bad block" it has already tried it several times, including a
> > bunch of "recalibrates" etc etc. For comparison, the Scsi-disk driver
> > doesn't do any retrying.
> 
> It helps for some things like magneto-opticals. For generic hard drives
> its only relevant for older devices.
> 
> > (*) Note: Tested last month: The driver still works for MFM
> > drives. However, the initialization apparently is not enough
> > anymore. The drive did not work when the BIOS didn't think there was a
> > drive.
> 
> Please file a bug report if 2.6 also shows that problem.
> 
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