External HD Format-Partition?

I just purchased a CAVALRY 500GB External HD (NTFS - SATA)to store mac and pc video, audio, and pics, deamweaver web sites, msword files, and ms excel files. It connects via USB. I wish to be able to use this both on my win xp computer, and my ibook g4 currently with osx 10.3 and soon to be updated to 10.4 or newer if out soon.
Mfg description said pc and mac useable - i can't copy to the cavalry - tried to copy an imovie file to it and got error relative to not being able to write to the drive.
Should/can i choose one format for this drive to reformat so i can use it as i wish
-or-
(not sure about this) should/can i divide the cavalry into 2 volumes, one volume formatted for mac files and one for pc
-or-
is there a more effecient way to accomplish this?

You can use the instructions in this article to partition the drive, with one partition intended for use with each OS. Other options include formatting the whole drive as FAT32(can't be used as a Mac OS X startup disk and can't accomodate files 4GB or larger), use MacDrive and format the drive as Mac OS Extended(cost and can't be used as a Windows startup disk), or install MacFUSE while leaving the drive in its current format(harder to set up and cannot be used as a Mac OS X startup disk). Since the drive is an USB drive, you can't use it to start up Mac OS X on a PowerPC Mac anyway.
(21262)

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