Re: IDE-Driver Disk Accounting Missing, Maybe SCSI too......

Alan Cox (alan@lxorguk.ukuu.org.uk)
Tue, 11 Aug 1998 16:20:32 +0100 (BST)

> > That is worse. Disabling UDMA actually makes you _more_ vulnerable
> > to corruption by other causes. Disabling the UDMA speed stuff also
> > handily disables all CRC/parity checking.
>
> So there is nothing that can be done for these people other than a
> printk("Bad luck, your IDE is broken and your data might get hosed")?
> Does Windows also trash data with these drives?

No you misunderstand. There are two species of problem

1. 3 of 4 drives from two vendors that don't do UDMA right and
corrupt stuff

2. An undefined number of unpredictable circumstances where UDMA
CRC will avoid other corruption caused by poor hardware/cabling

So you only want to disable UDMA for #1. Disabling it globally by default
will harm other people, and not to a predictible pattern. Hence the current
solution is far from optimal

Alan

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