The fastest way to clear a USB stick in Windows 10 is to format it: open File Explorer, right-click the USB drive under This PC, choose Format, pick a file system (exFAT works with most devices), and click Start. Leave Quick Format checked for everyday use, or uncheck it if you’re giving the drive away, so Windows overwrites the data instead of just hiding it.
Below are four ways to clear a USB drive, from simply deleting files to securely wiping it, plus how to fix a stick that shows the wrong size or won’t format.
Before you start
- Back up anything you need. Every method below erases the drive.
- Unplug other external drives so you don’t pick the wrong one.
- Note the drive letter and size in File Explorer.
Method 1: Delete the files
- Open the USB drive in File Explorer.
- Press Ctrl + A to select everything.
- Press Shift + Delete and confirm. Files on a USB drive usually skip the Recycle Bin either way.
This frees space but leaves the data recoverable with recovery software, so don’t use it before giving the drive away.
Method 2: Format the drive in File Explorer
- Open File Explorer and click This PC.
- Right-click the USB drive and choose Format.
- Choose a File system:
- exFAT for drives used on Windows, Mac, and most TVs and cameras, with support for files over 4 GB.
- FAT32 for older devices, but it can’t store files larger than 4 GB.
- NTFS for drives used only with Windows PCs.
- Type a name in Volume label if you like.
- Check or uncheck Quick Format (see below), then click Start and OK.
Quick Format vs. full format
A quick format clears the file table, so the drive looks empty but old data can often be recovered. A full format (Quick Format unchecked) also writes over every sector, which takes much longer but makes recovery far harder. Use a full format if the drive held personal or work files and you’re passing it on.
Method 3: Use Disk Management
Use this when the drive shows less space than it should, has several partitions, or won’t format in File Explorer.
- Right-click the Start button and choose Disk Management.
- Find the USB drive in the lower pane. Check the size carefully so you choose the right disk.
- Right-click each partition on it and choose Delete Volume.
- Right-click the Unallocated space and choose New Simple Volume.
- Follow the wizard, choosing a drive letter, file system, and label.
Method 4: Wipe it completely with DiskPart
DiskPart can clear every partition and, optionally, overwrite the whole drive. Choosing the wrong disk erases it, so go slowly.
- Search Start for cmd, right-click Command Prompt, and choose Run as administrator.
- Type
diskpartand press Enter. - Type
list disk. Identify the USB stick by its size. - Type
select disk 2, replacing 2 with your USB disk’s number. - Type
cleanto remove all partitions, orclean allto overwrite every sector with zeros (much slower). - Type
create partition primary, thenformat fs=exfat quick, thenassign. - Type
exit.
Wipe deleted files without formatting
If you’ve already deleted sensitive files but want to keep the rest of the drive’s contents, Windows can overwrite just the free space. Open Command Prompt and run cipher /w:E:\, replacing E with your USB drive’s letter. Windows writes over the unused space three times, so previously deleted files can’t be recovered. It can take a long time on large drives, and it doesn’t touch files that are still on the drive.
Which method should you use?
| Goal | Method |
|---|---|
| Free up space quickly | Delete files or Quick Format |
| Change file system (e.g., to exFAT) | Format in File Explorer |
| Fix wrong size or extra partitions | Disk Management or DiskPart clean |
| Give away or sell the drive | Full format or DiskPart clean all |
Troubleshooting
- “Windows was unable to complete the format.” Try Disk Management or DiskPart. If those fail too, the drive may be failing.
- “The disk is write-protected.” Check for a lock switch on the drive. In DiskPart, after selecting the disk, run
attributes disk clear readonly. - The drive shows only a few MB or GB. It probably has a leftover partition from a bootable installer. Use DiskPart
clean. - FAT32 isn’t offered for large drives. Windows’ Format window only offers FAT32 for drives up to 32 GB. Use exFAT instead.
Related: How to format a USB drive in Windows 11.
Related: How to access a USB drive on Windows 10.
Related: See connected USB devices on Windows 10.
Frequently asked questions
Does formatting a USB stick erase everything?
Yes, all files are removed. A quick format leaves data recoverable; a full format overwrites it.
Which format is best for a USB stick?
exFAT for most people, since it works on Windows and Mac and handles large files.
Can I clear a USB drive without losing the files?
No. Copy the files to your PC first, then clear the drive and copy back what you want to keep.
Kermit Matthews is a freelance writer based in Philadelphia, Pennsylvania with more than a decade of experience writing technology guides. He has a Bachelor’s and Master’s degree in Computer Science and has spent much of his professional career in IT management.
He specializes in writing content about iPhones, Android devices, Microsoft Office, and many other popular applications and devices.