Firewire drive not accessible after sleep

I have an external firewire drive connected. The drive works fine until the Mac sleeps.
The Mac sleeps and the drive spins down.
On wake from sleep, the system cannot access the drive. I can hear the drive spin up and it is still mounted on the desktop and in Disk Utility but the system cannot access it (spinning beach ball).
Any apps that were accessing the drive at sleep time are now locked up waiting for the drive eg FCP. The only way I can recover is to switch the drive off and on again and FCP etc has to be force quit. This drive has the Prolific PL3507 chip.
Anyone know how to fix this? I think I should return it to the supplier.
My other drive with Oxford 911 chip works fine, never a problem.
Bruce
imac intel 20   Mac OS X (10.4.6)  

Couldn't resolve it.
Took the gear back to the shop and finally got a refund. Be careful with Prolific stuff.

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    The computer is a brand new 24-inch, 2.8Ghz, iMac with Leopard installed from the included DVD immediately after opening the box - I did nothing before installing Leopard.
    This is my first Mac (I am a Unix refugee) so I may very well be doing something entirely stupid, but surely external disks should still be mounted (or automount) after the computer returns from sleep. What am I doing wrong? I also don't see any way to force Leopard to mount the drive, but I probably just don't know where to look.
    To be completely clear... the drive is plugged directly into the iMac on USB, no external hub. There is no networking involved with this disk. I didn't make any kind of settings to the disk (either to the disk itself- there aren't any, or on the iMac when I plugged the disk in). The only thing I did was answer "Yes" when Time Machine popped up a window asking if I wanted to use the new disk for backups. Last time the disk was mountet (before the computer went to sleep again) I ran the Disk Utility and it said the drive was fine.
    Thanks,
    Mark
    P.S. I'm sorry if this has been discussed elsewhere but I couldn't find it. Like I say, I'm new to the Mac and to these forums, so please forgive me if this post is redundant.

    Greetings,
    intelligenceresigned wrote:
    Ok, I went into console, and forced my iMac to sleep to see what the console would show was actually happening. I am not a very computer savvy person, but this is what the console said:
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    Thanks,
    Mark
    P.S. To save questions: I've tried all the easy stuff: Switched cables, swapped out the hub I have on one of the ports, tried different devices in the ports (so far an HP printer, Iomega external disk, iPod Touch, and Sony usb flash drive). Nothing resolved the issue. My keyboard and mouse are connected to a 2.0 High Speed hub. I've tried using another hub, but it didn't make any difference.

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