Poor external Firewire Drive writing speed

Discussion in 'Mac Basics and Help' started by Sofad, Jan 24, 2008.

  1. Sofad macrumors member


    Jan 24, 2006

    i have a problem with my external hard disk. The write performance is very poor. It's an Western Digital MyBook, connected via Firewire to an G4 Yikes (PCI) 400Mhz Powermac.

    Reading from that disk is fast (16 MB/sec) writing to the disk is below 1MB/sec.

    I'm running Panther 10.3.9, the external drive is fresh formatted in HFS+ Journaled.

    I tried 3 different firewire cables, the external hard disk is connected to the power. The speed is the same on both firewire ports of the powermac.

    I disconnected all other peripherales, if i duplicate a file on the internal drive the speed is ok (i did that to check if the internal drive has problems).

    see the attached benchmark for details...


    today i tried another 40gig external firewire harddrive, the same thing. fast read, slow write speed...

    Any ideas?

    Thank you...

    Attached Files:

  2. richard.mac macrumors 603


    Feb 2, 2007
    51.50024, -0.12662
    how is USB? do you have a USb 2.0 external hard disk to test with? maybe your firewire port is dying? might be your WD drive too.

    USB will be a little slower at it uses CPU load but firewire does not so its not an issue with the G4 chip.
  3. Sofad thread starter macrumors member


    Jan 24, 2006
    USB 1.1 only on this mac...

    the wd ist new, i tried it with another harddrive, same thing...

    i wonder why the reading speed is 20x faster...

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