How to Format a USB Flash Drive in Windows and Mac

Formatting a USB flash drive is something most computer users don’t think about, as most drives are formatted out of the box, and ready for most use cases. However, there are times when reformatting becomes necessary. You might need to erase all data, fix a compatibility issue, or prepare the drive for use with a different device or operating system.

Modern operating systems include built-in tools that make formatting quick and straightforward, without the need for additional software. This article explains when and why you might need to format a USB flash drive and walks through how to format it in Windows 11 and on a macOS 13 or later.

What does formatting a USB drive actually do?

Formatting is the process of prepping a storage device to store information, like a hard drive, solid-state drive, flash drive, etc. It creates a filing system that organizes your data and allows you to maximize the space for your files. You might format a USB flash drive when using it for the first time, when switching between different operating systems, or when fixing errors that prevent files from opening or copying correctly.

Formatting also removes existing data from the drive, which can help resolve performance issues or clear space for new files. While the process is usually quick and straightforward, it is important to back up anything you want to keep before you begin, as formatting permanently erases stored data.

There are two types of formatting on a USB drive:

• Quick format: Deletes the file system structure and makes the drive ready for use again, but it does not scan for errors or fully erase the data. The existing files are no longer visible, though the data may still be recoverable with specialist software. This option is fast and commonly used when the drive is working normally and simply needs to be cleared.
• Full Format: Completely rebuilds the file system and scans the USB drive for errors or bad sectors. It also overwrites existing data, making recovery much more difficult. This process takes longer but is recommended if the drive is experiencing errors, performance issues, or is being prepared for reuse or disposal.

Note: Kingston previously offered a specialized Format Utility designed exclusively for a specific USB drive model from 2015. This utility is not required for formatting any other Kingston USB flash drives, SSDs, or cards as current operating systems come with built-in formatting tools.

• For formatting a USB drive: See the step-by-step instructions for Windows and macOS below.
• SD or microSD cards: You can follow similar steps, but for best compatibility across devices, use the official SD Association Formatter.
• For Kingston SSDs: you can secure erase your SSD using Kingston SSD Manager. Once erased, you can format the SSD in Windows Disk Management.

Important: Do not download the old Kingston Format Utility from third-party websites.

Understanding USB file system options: FAT32 vs exFAT vs NTFS

When formatting your drive, it’s important to understand the different formatting options available for your ideal use. The file systems most commonly used in USB flash drives are:

• FAT32 is a common option you’ll hear because it’s recognized by both Mac and Windows operating systems, but it offers no security and caps files at 4GB in size. Most USB flash drives will have a FAT32 file system out-of-box. It is the most compatible file system for older/modern computers (PC and Mac) plus gaming consoles and other devices with a USB port.
• exFAT is the ideal file system for USB flash drives. It doesn’t have the 4GB file size limit and it’s compatible with most Windows and Mac operating systems. Older operating systems might require an update to properly read and write to a USB drive with an exFAT file system.
• NTFS format is the file system Windows likes to use by default for internal drives running the operating system or used as a secondary storage drive. It has a much larger max file size but is read-only on Mac OS X (unless you install a third-party NTFS read/write utility).
• Mac OS Extended (also known as HFS+) was the native solution for Mac OS 8.1 through OSX 10.14. Only use this option if the drive will only be used in Mac OS. Windows will not detect this file system without a third-party utility. You can use it for SSD boot drives for these versions of Mac OS, but it does not have much practical use as a file system for USB flash drives.
• APFS (Apple File System) is Apple’s modern file system introduced with macOS 10.13 (High Sierra) in 2017. Designed for SSDs and newer Macs, it includes advanced features like cloning, space-sharing, and file-level encryption. APFS is required for boot drives on macOS 10.13 and later. However, it is not natively supported by Windows, so if you need a USB drive that works across both macOS and Windows, it’s best to use exFAT or FAT32 instead.

Kingston USB drives that are 32GB and under are preformatted as FAT32 while 64GB and larger are preformatted as exFAT. Both can be read by and written to by any modern OS.

Common uses for USB flash drives

USB flash drives serve a wide range of purposes beyond simple file storage. From transferring data between devices to powering entertainment systems and even supporting critical recovery tasks, they don’t require an internet connection, so files can be accessed anywhere. Here are some of the most common ways people use them:

• File transfers: Easily move documents, photos, and videos between computers, perfect when there’s no internet connection. For maximum compatibility across Windows and macOS, use exFAT.
• Backup storage: Keep important files safe with quick backups on a USB drive. For sensitive data, use a hardware encrypted USB for added security. Choose exFAT for large files or FAT32 if you need older device support.
• Clearing space on your phone: Move your old photos, videos, and backups from your phone to free up space for new adventures. exFAT is the best choice because it supports large files and works across most modern devices, including Android and iOS.
• Device recovery and repair: Creating a bootable USB is essential for reinstalling an operating system or fixing system issues. It’s a reliable tool for troubleshooting, recovering lost data, or performing a clean OS installation. For Windows recovery drives, use NTFS.
• Gaming: USB drives are often used to store game saves, mods, screenshots, or used as a portable game library. Proper formatting can reduce errors and improve load times. exFAT is ideal here, as it handles large game files and works across Windows and most modern consoles.
• Media playback: USB drives are a convenient way to play videos, music, or view photos directly on TVs, game consoles, and media boxes. Correctly formatting the drive ensures your device can read movies, photos, and other media without any issues. FAT32 works for most devices; for files over 4GB, choose exFAT if supported.
• For your car: USB drives are widely used in cars, from playing music to updating software. Many car stereos require FAT32 or exFAT for reliable music playback, while vehicle software and map updates often demand a specific file system to be recognized.
• Dash cams and security systems: Some high-end vehicles feature built-in dash cams. While these systems usually rely on microSD cards for continuous recording, USB drives can be used to export footage or perform firmware updates. FAT32 is the most widely compatible file system here, while exFAT may work on newer models for larger files.
• Music and DJ use: DJs rely on fast, reliable access to their music. Formatting a USB in the right file system ensures controllers and club systems read tracks instantly, avoiding playback failures during a live performance. FAT32 works with most DJ gear; for larger music libraries, exFAT may be supported on newer equipment, always check before a live set.

Formatting USB flash drives in Windows 11

1. Insert a USB drive into a USB port.
2. Open File Explorer.
3. Click on This PC from the left pane.
4. Under the "Devices and drives" section, right-click the flash drive and select the Format option.
5. Use the "File system" drop-down menu and select the preferred option.
6. In the "Allocation unit size" drop-down menu, use the default selection.
7. In the "Volume label" field, confirm a drive name that will appear in File Explorer. For example, KingstonUSB.
8. Under the "Format options" section, select the Quick format option or don’t depending on the use case.
9. Click the Start button.
10. Click the Yes button.

Once format is finished, the USB flash drive will be all set to store documents, pictures, videos, and other files on the removable drive.

Formatting USB flash drives on a macOS 13 and later

1. Insert the USB drive into an available USB port on your Mac.
2. Open “Disk Utility”, go to: Applications > Utilities > Disk Utility.
3. Show all devices (if needed):
   If you’re planning to format the entire drive (especially for APFS or GUID partitioning), click the View button in the upper-left corner of Desk Utility and choose “Show All Devices”.
4. Select your USB drive:
   In the left-hand sidebar, choose the top-level device (usually named something like “Kingston DataTraveler Media”). Avoid selecting just the volume underneath (e.g. “KINGSTON”), unless you’re only formatting the partition and not the entire disk.
5. Click “Erase” at the top of the window.
6. Choose your file system from the “Format” dropdown menu:
   • Use APFS if the drive will be used with macOS 10.13 or later
   • Choose Mac OS Extended (Journaled) for older Macs
   • Select exFAT for use with both macOS and Windows
   • Use MS-DOS (FAT) (aka FAT32) only for drives 32GB or smaller, or for legacy compatibility
7. Choose “Scheme”, if available, select “GUID Partition Map”. This is required for APFS and modernmacOSbootable drives. This option may not be available unless you selected the full device in Step 4.
8. Enter a name for the drive.
9. Click “Eras.” to begin the formatting process.
10.  Once complete, click “Done” and close Disk Utility.

Once formatting is complete, the USB flash drive will be all set to store documents, pictures, videos, and other files on the removable drive.

Why formatting your USB drive matters

Formatting a USB flash drive isn’t just about clearing space, it’s about making sure your drive works reliably across all your devices. Whether you’re preparing it for file transfers, gaming, media playback, or creating a bootable recovery tool, choosing the right file system can make a big difference in performance and compatibility.

By taking the time to format your USB drive properly, you’ll avoid frustrating errors, improve speed, and ensure your drive is ready for whatever you need, whether that’s storing family photos, running a DJ set, or reinstalling an operating system.