My Sony camcorder requires a FAT file system on the external hard drive. Can I reformat the passport to FAT and still use it to back up files on my computer which has the NTFS system
WD has a Passport AV which designed to work with Sony Camcorder.
Please click on the link below for more detail
When the drive is formatted with FAT file system. It still works with your computer using NTFS file system.
The only down side is FAT file system is limit to 4GB file size.
Another word, you still can copy as many files but each file can not be larger than 4GB in size.