Slow P2 Import Problem (20 minutes!)

I've tried all sorts of scenarios and configurations in terms of how I get the P2 Data onto my hardrive, and then import it into FCP (IE direct from camera, direct from p2 store, p2 store to firewire to internal scratch disc etc) but when using the "import p2" function in FCP 5.04, it takes between 16-25 minutes to import a single 4GB card's worth of data.
When I first start the import, it seems to run fine and gives me a reasonable estimate of the time (4-7 minutes). But, once it reaches the end of a clip, the process seems to hang, and I get the little spinny color wheel for a few minutes, then it progresses again at a normal speed, then it hangs, and so on for each clip on the P2 card until the process is done. The stuff imports fine and the clips work, it just takes forever.
From my observations, it feels as though the copying of each clip happens fine, and that the hang up occurs as FCP is doing it's unwrap/wrap of the MXF files. Can't figure out why this process should cause the program to grind to a screeching halt.
Everything else in my system seems to be working fine.
Any thoughts as to what might be going on, and how I might remedy it would be greatly appreciated!
PowerMac G5 Dual 2Ghz   Mac OS X (10.3.9)   2.5 GB RAM

I very much appreciate the help. Sorry for any lack of clarity or apparent density on my part. Up late last night.
I have a single internal drive formatted "Mac OS Extended (journaled)". It is a 160GB drive with 20GB free.
I have two maxtor FW 400 160GB drives. Each with about 80GB free. One plugged into the back of the computer, one into the front. Not daisy chained.
I have a P2 Store which connects via USB 2, and the HVX which I connect to the FW 800 port on the back of the computer.
Like I said, I've tried every conceivable combination of these devices. I've imported directly from the camera via FW to the internal drive using FCP. I've gone from the camera directly to both of the FW drives using FCP. I've also transferred from the camera, to the internal drive, then imported using FCP from the internal to the FW drive set as my scratch disc. And so forth.
But no matter what the permutation, I get the same result. And again, it doesn't seem to be an issue of moving these blocks of data around. That seems to happen just fine as far as I can tell. If I start the import, then watch the clips being created in the capture folder, they agregate just fine. It's only once they've reached their full data size (in ref'c to the original mxf files) that the import process hangs. The larger the clips, the longer the hangs (though fewer in number, obviously).
I deleted the FCP preferences and repaired permissions on my internal HDD with no alteration of the problem.
The only other observation I've had, is that when the hangups happen, and the little ball starts spinning, I also hear a high pitched whining from inside the computer case. It does not sound like usual HDD work.
Hope that I've given a better sense of the situation. Thanks for bearing with me
GPL
PowerMac G5 Dual 2Ghz Mac OS X (10.3.9) 2.5 GB RAM

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    All of the following were using my laptop:  Previously I had no problem with LR2 for any functions.  I just purchased an Epson 7000 media storage device, and in early August and practiced importing images into LR2, and those images were pulled in OK. Next, I upgraded to LR3.  I discovered that the Epson's images had been placed into a wrong folder when I opened LR3.  I used the remapping function in LR3 to move the images into the correct folder.  Next, I used a SanDisk card reader to import images into LR3 into an existing folder of images, but the following error message appeared "the following files were not imported because they could not be read" (Import Results said  'some import operations were not performed').  I tried importing a single image, and multiple images, but had the same error.  I tried switching the card reader to each of 4 different USB port on the laptop, with the same error occurring on each USB port used.
    In order to try to isolate the problem.  I took the SanDisk card reader with the memory card and successfully imported the images into LR3 on my Macintosh desktop computer; so to me the problem is not the card reader or the memory card.  I also used the SanDisk recovery disk while using my laptop to look at the files on the memory card and I could see all the images correctly while in the recovery program, but I have not copied the images to the laptop's hard disk, and have not tried an import into the laptop's LR3.  I did not import images directly from my camera to the laptop LR3 since I did not think it would help with the troubleshooting. 
    I then ran the Repair from the Adobe LR3 CD upgrade disk, on my laptop.  Then I tried doing the import using the SanDisk reader and memory card, but the same problem occurred and same error message, that the files could not be imported (I was trying to import into a folder of existing images).  I then used the Laptop's Control Panel function to remove LR3 application.  Then I did a fresh upgrade of LR3 on my laptop, but the same error message and I am unable to do any import of the memory card from the card reader.  I then tried to do an image import from the Epson 7000 into the laptop, and the same error message and I am unable to do any import into a folder with existing images.   I then tried doing an image import into LR2 on the laptop, and got the same problem to occur when trying to import into an existing folder of images.  I have a couple of  Canon EOS SLR digital cameras, and the issue occurs for any of the file types of the cameras.
    Went into LR3 Preferences, General Tab, I now checked the previously unchecked box for Import Options - "Show import dialog when a memory card is detected".
    Connected the Canon XTi directly with a cable to the laptop computer.  Note that Canon's information said that Picture Transfer Protocol is automatically used when the XTi is directly connected to a computer, so I did not need to change anything in the camera's menu for communications choices (there is no communication menu in fact).  I selected one image and copied it to the laptop desktop.  Tried to import it into LR3 into a folder of existing images but got the error message "Could not copy a file to the requested location."  While in LR3, I changed the location of where the file would be copied into - any of my existing folders of images; tried 5 different folders, but kept getting the same error message.
    With the card reader connected via USB port on the laptop, I copied one image file to the desktop, and then tried importing into LR3 into a folder of existing images.  Got the error message "Could not copy a file to the requested location."]]]]

    I am not clear if by 'import' you are trying to copy or move the files from a location to another or if you are adding the files to a catalog.  My comments may not, therefore, be too helpful.
    Firstly, with both LR2 and LR3 installed you will have both catalogs present, but if you try to open the LR2 catalog with LR3 you will be prompted to update the catalog.  You will thus know which catalog you are working on. 
    Secondly, if you are reading direct from the camera, you should connect using the 'PC connection' mode.
    Thirdly, there is an issue with reading .CR2 files directly from the early Canon DSLRs (in Europe named 300D, 350D, 400D).  While they are visible with the Canon software, they can not be seen with Windows explorer nor can they be accessed with Lightroom. 
    I suggest that you take the CF card out of the camera and copy the files using Windows Explorer in to the destination folder.  You are then sure that the files are on the PC.
    If you have the right Codec installed, you can view them with Windows photo gallery; if you don't, you can use one of the Canon software packages to view the files.  You are then sure that the files are not corrupted.
    Then import the files to your LR catalog using the normal import routine selecting 'add without moving'.  I have tried this routine  successfully using my 350D using both LR1.x and LR3.x.  If that doesn't work - I'm lost.
    Frank

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