Linux-kernel mailing list archive 2000-02,: Re: Data corruption reading IDE CD-ROM in 2.2.x

# Re: Data corruption reading IDE CD-ROM in 2.2.x

Khimenko Victor (khim@sch57.msk.ru)
Sun, 9 Jan 2000 23:08:59 +0300 (MSK)

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In <E127MBM-00020W-00@the-village.bc.nu> Alan Cox (alan@lxorguk.ukuu.org.uk) wrote:
>> I do see a lot of WD drives om the DMA blacklist, but not yours.
>> Perhaps Andre can expand on this?

> The WD blacklist is taken from WD's own list of drives that could fail in
> some cases and had firmware updates. We've found no way to see if the firmware
> was updated so we block them all

My CD-ROM (SONY CDU4011) will not corrupt anything when used with DMA enabled.
It'll just froze the whole system. As it does this in both all versions of
Linux I've tried and in Windows98 I suspect hardware problem ...
Since I am used few different hard disks with DMA for more the year here I
think it's CD-ROM problem and not MB problem.

>> > And, certainly, I still wonder why it silently corrupted the data... Do I
>> > have bad hardware or something weird in the kernel?
>>
>> Judging by WD's track record I wouldn't rule out bad hardware.

> The DMA problem was a specific range of drives.

P.S. BTW is it possible to turn off DMA usage when there are no CD in drive ?
hdparm -d 0 giving 'No medium found' and when I forget to disable DMA before
first try to mount CD I'm getting total system freeze :-(( Really annoying ...

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- Next message: Harald Koenig: "2.3.38 breaks isapnp as module"
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- Maybe in reply to: Stanislav Malyshev: "Data corruption reading IDE CD-ROM in 2.2.x"
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- Reply: Jens Axboe: "Re: Data corruption reading IDE CD-ROM in 2.2.x"