If the drive comes formatted in NTFS, which is the default file system for Windows, you're going to want to re-format the drive because Mac OS X can't write files to NTFS-formatted volumes (at least not without a bunch of extra work that's beyond the scope of this article). The first format, FAT32, is fully compatible with Mac OS X, though with some drawbacks that we'll discuss later. The overwhelming majority of USB flash drives you buy are going to come in one of two formats: FAT32 or NTFS.
