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Thread: UDMA/33 using a 40-wire cable - correct drive read speeds? using hdparm

  1. #1
    Join Date
    Mar 2009
    Beans
    13

    Question UDMA/33 using a 40-wire cable - correct drive read speeds? using hdparm

    I'm trying to work out if I'm getting the best speed I can out of my HDD as my system can be a little slow somedays... (I'm using hdparm to test the read speed)..

    The system (xubuntu 8.04) is running from a 133x Compact Flash Card, connected by a 40-wire cable to the motherboard.

    my dmesg states:
    Code:
    [   24.610923] ata1.00: ATA-4: ELITE PRO CF CARD 4GB, 20071207, max UDMA/66
    [   24.610934] ata1.00: 7831152 sectors, multi 0: LBA
    [   24.610958] ata1.00: limited to UDMA/33 due to 40-wire cable
    [   24.627191] ata1.00: configured for UDMA/33
    [   24.627281] ata2: port disabled. ignoring.
    I have found other people referencing a bug with what UDMA mode Ubuntu 8.04 recognises, and my hdparm -i for the drives states:
    Code:
    UDMA modes: udma0 udma1 *udma2 udma3 udma4
    Drive conforms to: Unspecified:  ATA/ATAPI-4
    ...and obviously it isn't managing to use UDMA4 / ATA4 - but am I to assume that as I AM actually using a 40-wire cable, that UDMA/33 is the best I will ever get out of it? Can a 40-wire cable go no faster? As I was thinking of replacing the card with a 266x speed one?



    Also, my hdparm -tT dev/sda1 gives:
    Code:
    Timing cached reads:   356 MB in  2.00 seconds = 177.91 MB/sec
    Timing buffered disk reads:   66 MB in  3.04 seconds =  21.74 MB/sec
    Are these speeds reasonable - or is it likely to be causing things to run a little slowly?

    Bit of a n00b question I'm sure - so apologies!

  2. #2
    Join Date
    Nov 2005
    Beans
    58

    Re: UDMA/33 using a 40-wire cable - correct drive read speeds? using hdparm

    You've probably worked this out already - but I just stumbled across this... What you need is an 80 wire IDE cable. Then you can go upto udma6 (if your controller supports it).

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