Reformatting a USB drive takes only a few minutes on both Windows and Mac but a full format, a damaged drive or a large-capacity USB drive can take longer. Whether you need FAT32 for maximum device compatibility or exFAT for large files, this guide walks you through every method, format choice, and common error you might encounter.
What does it mean to reformat a USB drive?
To reformat a USB drive means to remove normal access to the existing data and apply a new file system to the drive, making it ready for fresh use. The process creates a new file system and directory structure on the selected volume. If you erase or repartition the whole drive, the partition table may also be rebuilt.
There is a practical distinction worth understanding: formatting and reformatting describe the same technical operation. “Reformatting” simply implies the drive has been formatted before. Both terms refer to the same menu options in Windows and Mac.
When you reformat, you choose a file system. That choice determines which devices can read the drive and what file sizes it supports. The three formats you will encounter are:
- FAT32: Compatible with virtually every device, including TVs, game consoles, DSLR cameras and car stereos. Best for drives up to 32 GB in normal Windows/Mac formatting tools and individual files up to 4 GB.
- exFAT: The modern replacement for FAT32 on larger drives. It removes FAT32’s 4 GB file-size limit and is supported by modern Windows and macOS versions, as well as many newer TVs, cameras and consoles.
- NTFS: Windows-native format, ideal for drives used exclusively with Windows PCs. Macs can read NTFS drives but cannot write to them without third-party software.
If you are unsure which format to pick, use FAT32 for drives up to 32 GB that need to work across many different devices, and exFAT for anything larger than 32 GB or when you need to transfer files over 4 GB.
Quick rule: FAT32 for drives up to 32 GB and maximum compatibility. exFAT for drives larger than 32 GB or for files bigger than 4 GB. NTFS for Windows-only use.
How to reformat a USB drive on Windows
Windows offers two built-in routes: the right-click Format menu in File Explorer, and Disk Management. For most drives, File Explorer is faster. For drives larger than 32 GB that you want to format as FAT32, Windows’ graphical tools may not offer FAT32. Use exFAT instead, or use a command-line method or a trusted third-party tool if a specific older device requires FAT32.
Before you start: Formatting removes access to every file on the drive. If you’re not certain the drive is empty, back up anything important first – see how to recover your files before you reformat.
Method 1: File Explorer (quickest for drives up to 32 GB)
Method 2: Disk Management for partition problems
File Explorer on Windows 10 and 11 usually does not list FAT32 as an option for drives above 32 GB. Disk Management is useful for partition problems, but it usually does not bypass this FAT32 limit in Windows’ graphical tools.
Open Disk Management by pressing Win + X and selecting ‘Disk Management’, or by typing diskmgmt.msc in the Run dialog (Win + R). Locate your USB drive in the lower panel. Right-click the volume bar (not the disk label on the left) and select ‘Format’. In the dialog, choose exFAT or NTFS if appropriate. If FAT32 is required for a drive above 32 GB, use a trusted FAT32 formatting tool or, where supported by your Windows version, the Command Prompt method: open CMD as administrator and type format /FS:FAT32 /Q X:, replacing X with your drive letter. On newer Windows 11 builds, Microsoft is increasing the command-line FAT32 formatting limit to 2 TB, but availability depends on your Windows version. For most large USB drives, exFAT is still the more practical choice unless an older device specifically requires FAT32.
Important: Formatting removes access to the files on the drive and may overwrite data depending on the method used. Back up any files you want to keep before you proceed. Data recovery after a quick format may be possible if no new data has been written. Recovery after a completed full format is much less likely.
How to reformat a USB drive on a Mac
On macOS, the built-in tool is Disk Utility. It handles all common USB formats, including FAT32 (listed as ‘MS-DOS (FAT)’), exFAT, and APFS. The process usually takes only a few minutes.
Method 1: Reformatting with Disk Utility
Method 2: Reformatting via Terminal for FAT32
If Disk Utility fails but the drive still appears in diskutil list, Terminal can provide an alternative. Open Terminal and type diskutil list to identify your drive’s identifier (typically disk2 or disk3). Then run: diskutil eraseDisk FAT32 MYUSB MBRFormat /dev/disk2, replacing MYUSB with your preferred name and disk2 with your actual identifier. This command formats the entire disk as FAT32 with a Master Boot Record partition scheme.
FAT32 vs exFAT vs NTFS: Which format should you choose?
The choice between FAT32 and exFAT comes down to three factors: drive size, the devices that need to read it, and maximum file size requirements.
| Feature | FAT32 | exFAT | NTFS |
|---|---|---|---|
| Max. individual file size | 4 GB | no practical limit for normal USB-drive use | far beyond normal USB-drive use; depends on Windows version and cluster size |
| Max. volume size | 32 GB in Windows’ graphical formatting tools; larger FAT32 volumes are technically possible | far beyond normal USB-drive capacities | far beyond normal USB-drive capacities |
| Windows 10/11 | Read and write | Read and write | Read and write |
| macOS | Read and write | Read and write | Read by default; writing requires additional software |
| TVs, consoles, cameras | Excellent compatibility | Good compatibility with newer devices | Limited compatibility |
| Journaling (crash recovery) | No | No | Yes |
FAT32 remains the safest choice for drives under 32 GB that you want to use with older TVs, Blu-ray players, DSLR cameras, and car audio systems. The 4 GB file size cap only becomes a problem when transferring large video files. A 4K video recorded on a modern mirrorless camera can easily exceed 4 GB per clip, at which point exFAT is necessary.
exFAT is used by SDXC cards according to the SD Association. If your USB drive is 64 GB or larger, exFAT is usually the practical default: it avoids FAT32’s 4 GB file-size limit and works with most modern computers and many newer consumer devices.
Common errors when reformatting a USB drive
Windows cannot complete the format
This error appears when a drive is write-protected, has a damaged partition, or contains bad sectors. Check the physical write-protect switch on the side of some USB drives first. If there is no switch, open Command Prompt as administrator and run the following sequence:
Type diskpart, press Enter. Then type list disk and press Enter to identify your drive number. Type select disk X (only after confirming the correct drive), then attributes disk clear readonly, then clean, then create partition primary, then format fs=exfat quick. Use format fs=fat32 quick only if a specific older device requires FAT32. This sequence removes the read-only attribute, wipes the partition table, and applies a fresh exFAT format.
Drive not showing in Disk Utility on Mac
If the drive does not appear in Disk Utility, click View, then ‘Show All Devices’. If it still does not appear, the drive’s USB controller may have failed. Try a different USB port and a different cable if your drive uses one. A drive that is visible in Disk Utility but greyed out may have an unmounted volume, a damaged file system or partition table, or a hardware/connection issue. If the device itself is visible, Erase may resolve some file-system or partition problems.
Drive shows wrong capacity after formatting
A 64 GB drive showing as about 29 GB after formatting may have multiple partitions, unallocated space, or in rare cases be a counterfeit or failing drive. On Windows, use Disk Management to delete unwanted partitions and create one new full-size volume. On Mac, select the drive in Disk Utility, click ‘Erase’, and ensure you are erasing the physical disk rather than an individual volume partition.
Before you reformat: How to recover your files first
Reformatting a USB drive removes normal access to the data stored on it. Before you proceed, check whether the drive contains anything worth keeping. If files appear missing already, that does not mean they are gone permanently. A quick format usually rebuilds the file-system metadata and may leave some underlying data recoverable until it is overwritten. Recovery software such as Recuva (Windows) or PhotoRec (cross-platform) may retrieve files from a quick-formatted drive if no new data has overwritten them, but success is not guaranteed.
If you store photos on USB drives long-term, consider whether those files also exist elsewhere. Many people keep their only copies of old photos on a single USB stick or legacy hard drive. If that drive fails after a reformat or due to physical damage, recovery becomes significantly harder. Our guide on storing and preserving old photos on USB drives and hard drives covers backup strategies in detail. For drives with mechanical or electronic damage, professional USB stick recovery may be the only viable path to retrieving lost files.
Before you reformat: Run a quick scan with Recuva or a similar tool. If files are already missing, attempt recovery before formatting. Writing new data to the drive after a format makes recovery increasingly unlikely.
When professional help makes sense
If your USB drive is not recognised by your computer, shows incorrect capacity, asks to be formatted, or has already been reformatted by accident with data you need, reformatting it again may make recovery harder. MEDIAFIX specialises in data recovery from flash storage, USB drives and physical media of all kinds. With experience from over 268 million media items processed, we can check whether your drive’s data is recoverable before any irreversible steps are taken.
Have questions? Our customer service is happy to help: 020 3904438-0
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Frequently asked questions
How do I reformat a USB flash drive on Windows?
To reformat a USB flash drive on Windows, plug it in and open File Explorer. Right-click the drive and select “Format.” Choose your preferred file system: FAT32 is usually best for older devices and small drives, while exFAT is usually better for larger USB drives and files over 4 GB. Tick “Quick Format” if you want a faster process, then click “Start.” Remember, formatting will remove normal access to the files on the drive, so back up anything important beforehand.
How do I reformat a USB drive on a Mac?
On a Mac, open Disk Utility from Applications > Utilities. Select your USB drive from the left-hand panel, then click “Erase” at the top. Choose a format – MS-DOS (FAT) is ideal for cross-platform compatibility, while ExFAT works well for larger files. Give the drive a name, then click “Erase” to confirm. All existing files will be removed from normal access during this process, so back up anything important first.
How do I format a USB drive to FAT32?
On Windows, right-click the USB drive in File Explorer and select “Format.” In the file system dropdown, choose FAT32. Note that Windows may not show FAT32 as an option for drives larger than 32 GB. In that case, use exFAT unless an older device specifically requires FAT32; if FAT32 is required, use a trusted FAT32 formatting tool or a command-line method supported by your Windows version. On Mac, select “MS-DOS (FAT)” in Disk Utility, which is equivalent to FAT32.
Will reformatting a USB drive delete everything on it?
Will reformatting a USB drive delete everything on it?
Yes, reformatting a USB drive will remove normal access to the data stored on it. A Quick Format rebuilds the file-system metadata and makes files inaccessible, while a Full Format takes longer and checks the drive for bad sectors. On modern Windows, a completed full format is much less recoverable than a quick format. If you have important files on the drive, back them up before starting. In some cases, data recovery software can retrieve files after a Quick Format if you act quickly.
Why won't my USB drive let me reformat it?
There are several reasons a USB drive may refuse to reformat. It might be write-protected – check for a physical lock switch on the side of the drive. The drive could also have a corrupted file system or bad sectors causing errors. On Windows, try using Diskpart via Command Prompt to force a format. If the drive is physically damaged or still unresponsive, professional data recovery may be necessary before any further action.
7 drop-off points 