If the drive is listed as NTFS-formatted, you're going to need to format it to something else if you want full compatibility with Mac OS X. If the drive's format comes up as MS-DOS (FAT) or, less likely, ExFAT, you may be able to simply leave the drive as-is and not bother reformatting it. Your new drive should appear in the left-hand column, and clicking the 'Partition' tab will bring up info on the drive which includes its current format. How do you tell which format your brand-new USB drive has? Hook it up to your Mac and launch the Disk Utility app, located in your Utilities folder (which is in Applications). 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. However, the file system is not supported by many older systems.The overwhelming majority of USB flash drives you buy are going to come in one of two formats: FAT32 or NTFS. In theory, data capacity of up to 2 TB is possible, but Microsoft has limited the partition size in newer systems to 32 GB in order to promote the modern NFTS format.ĮxFAT is a further development of FAT that in principle offers unattainable storage and data capacity. The maximum data size is limited to 4 GB in the latest version FAT32. It is not supported by many applications.įAT is a file system developed by Microsoft that is also supported by Linux and macOS. Mac OS Extended (Journaled) with the addition that the file system can differentiate between upper and lower case (e.g. HFS+ or Mac OS Extended (case-sensitive and journaled)

Windows/Linux devices are only able to read but not write on USB sticks in this format. A file system developed by Apple that is particularly suited to data media with large memory capacity.

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