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    SubjectRe: Is it safe to ignore UDMA BadCRC errors?
    On 29.12.03 12:52 -0700, Eric D. Mudama wrote:

    > On Mon, Dec 29 at 11:07, Jonathan Kamens wrote:
    > >The topic of CRC errrors from IDE drives has been discussed numerous
    > >times on this list, and I've reviewed those discussions, but I'm still
    > >not 100% certain of the answer to this question: Is it safe for me to
    > >ignore occasional CRC errors from my drive?
    > >
    > >Here are the details....
    > >
    > >The errors look like this:
    > >
    > > hde: dma_intr: status=0x51 { DriveReady SeekComplete Error }
    > > hde: dma_intr: error=0x84 { DriveStatusError BadCRC }
    > >
    > >They don't seem to happen often enough to convince the kernel to back
    > >down to a slower UDMA mode.
    >
    > 0x5184 is the error code for when the drive sends you data that was
    > corrupted during transmission over the cable. In general, nothing is
    > wrong with your drive, and a re-read from the drive will almost always
    > produce the proper data.
    >
    > Odds are your cable is bad, regardless of how "good" it looks, you
    > really can't tell if you have marginal conductivity on a pin or
    > something else wierd. In my home system I replace the IDE cables
    > every few years, on my test box at work I replace them every month
    > since I'm doing lots of re-plugging of drives. Note that a bad cable
    > is *dangerous* to your filesystem, since a PIO transfer to the drive
    > has *no* integrity checking on the cable!
    >
    > Also, those "round" cables violate the ATA spec, I can't really
    > recommend using them unless airflow is your #1 concern, however in
    > that case you're probably better off buying a SATA drive.
    >
    > Generic IDE ribbon cables (between 6" and 18") seem to work fine for
    > most people, just go buy another $2 cable from CompUSA and see if the
    > problem goes away.
    >
    > FYI, UDMA4 isn't that fast, only 66MB/sec... "good" (functional, not
    > brand name) flat cables should be able to do 100MB sec trivially.

    i wrote a mail to this list a few days ago.
    i have the same error messages as the above.
    but _only_ with kernel 2.6.0, _not_ with 2.4.20 ...
    thats strange. isnt it?
    after i little traffic on the hd`s the system freezes.

    --

    florian schuele
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