MacOSX can read but not write to NTFS volumes. While FAT32 works, it's not as damage resistant and has that nutty 4GB file limit.
I have a homemade 250gb external hard drive, and have used it with my windows XP computer for about a year now. I recently bought a Macbook, and want to use the extrernal drive to back up files. I plug it in to my macbook, it regonizes it, and I can read the files on it, but I can't write to the drive. I have looked through the drive's prefrences on my XP computer, but I can't find anything to address this issue. Hope you can help!