Major FireWire FLAW in OS X

Hi All,
this must be Major.....
I have experienced this on PPC as well as Intel...
I own a PPC G5 2.3GHZ and MBP 2GHZ both have FW 400/800
Here comes the tricky part....
I have on BOTH 4 FW 800 drive on the FW 800 bus and one BU drive on each on the FW 400 port...
Copying directly from a FW800 device on the FW 800 Bus to the Device on the FW 400 Bus causes the finder NOT to be able to read all the file... Ultimately rendering me a message that the copy could not be completed as some of the files could NOT be read/written
However, I know the files are all readable so I try this:
Copy the files I wanna from the FW800 device on the FW800 bus to an internal SATA hard drive. This works and about 10 times faster... Now I copy the files from the SATA to the the FW400 device on the FW400 bus and it works too - and about 10 times faster...
This must be a MAJOR bug within OS X...

When DU fails what error message is provided? Do you have Disk Warrior or TechTool Pro? Do the enclosures all us Oxford chipsets? Have you tried a different enclosure for the FW400 drive?
When you freshly formatted these drives is this what you did:
Extended Hard Drive Preparation
1. Boot from your OS X Installer Disk. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger.)
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. Otherwise, click on the Partition tab in the DU main window.
3. Set the number of partitions from the dropdown menu (use 1 partition unless you wish to make more.) Set the format type to Mac OS Extended (Journaled, if supported.) Click on the Partition button and wait until the volume(s) mount on the Desktop.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled, if supported.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process will take 30 minutes to an hour or more depending upon the drive size.

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