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    SubjectRe: Two hdds on one channel - why so slow?

    On Tue, 1 Jan 2002, Brian wrote:

    > This is an inherent quirk (SCSI folks would say brain damage) in IDE.
    > Only one drive on an IDE chain may be accessed at once and only one
    > request may go to that drive at a time. Therefore, the maximum you could
    > hope for in that test is half speed on each. Throw in the overhead of
    > continuously hopping between them and 12MB is no surprise.

    So?!? This ATA100 and ATA133 standards do not make any sens? It is not
    possible to have more than 66 MB/sec with on drive and is seems that it is
    not possible to use more than ~30MB/sek of 100 or 133 MB/sec ATA100/133
    bus speed with two HDDs. Oh :(((

    Another question - why ATA100/ATA66 HDDs are so slow with UDMA33?
    With new IBM 60 GB IC35L060AVER07-0 I have much more than 33 MB/sec with
    ATA100 and only 24 MB/sec with UDMA33 (Asus P2B with IntelBX). New 80GB Seagates
    (Baracuda IV) have the same problem.

    Best regards,

    Krzysztof Oledzki

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