Which one external hard drive is better for my G5's FW800 port?

Hi,
I use a late G5 under 10.4.11. Last two weeks I used two different Western Digital disks, My Book Studio & My Book Studio Edition II but both of them don't operate well with the FW 800. They conflict with my audio interfaces (FW 400 devices). Only at FW 800. At FW 400 and Usb 2.0 they operate fine.
Because of this I have to replace the WD disk and unfortunatelly I have two options from the store I bought it. And here is that I want your help please.
Which one external hard drive from these two is better for my G5's FW800 port?
Lacie Quadra 1TB External HDD by Neil Poulton or Verbatim Quad Interface External Hard Drive 1TB. Formatted HFS+ for Mac OS?
I'll very appreciate any answer. Spyros

Hi-
I think that looking at your other devices is needed.
Check out the Mackie troubleshooting guide for one:
http://www.mackie.com/support/documents/TechFAQno.1.pdf
Page 8 has specific suggestions regarding firewire and chipsets.
The same for the Presonus:
The firewire ports on a Mac (FW400 and FW800) run off the main logic board and share system resources. PreSonus interfaces are designed to be run in series with other firewire peripherals. If you are experiencing erratic performance or pops, clicks, and dropouts, daisy-chain your FW400 peripheral from the secondary firewire port on your PreSonus interface. If you must use a FW800 device, it is recommended to purchase a firewire expansion card for your Mac.
http://support.presonus.com/entries/119100-optimizing-your-computer-for-audio-ma c-osx
It appears to me that both devices require enough resources that the firewire controller of the G5 may be unable to properly support both FW400 and FW800 transfer rates.
It appears that the bandwidth requirements of the devices are forcing the machine to drop FW800 in lieu of supporting FW400.
Both makers suggest use of third party PCI cards for Firewire 800, and it may be that you need additional power to the firewire card to keep up with the I/O and bandwidth demands being placed on the machines by you audio devices.
You mention that someone told you to not use the Oxford chipset, but the best external drives are all those that have the Oxford chipset.
It is important to note that not all WD MyBook drives have the same chipset, and few of the WD drives have the Oxford chipset.
Asrock and VIA are other chipsets for the WD drives.
VIA is notoriously poor as far as Mac compatibility goes.

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