How to Format an SD Card or USB Drive on a Chromebook

SD cards and USB drives slow down or start throwing errors as they fill up with leftover data, and sometimes a drive formatted on a camera or another computer just won’t behave correctly on a Chromebook. The fix in both cases is the same. ChromeOS can format external drives with no extra apps needed, all from the built-in Files app.

Before you start: Formatting erases everything on the drive permanently. Back up anything you want to keep to your Chromebook, Google Drive, or another drive first.

How to Format a Drive

1. Plug the SD card or USB drive into your Chromebook.
2. Open the Files app from your Launcher.
3. Find the drive listed in the left sidebar and click it to make sure it’s the right one, especially if you have more than one external drive connected.
4. Right-click the drive’s name in the sidebar, or click the three-dot menu in the top right of the Files window.
5. Select Format device.
6. Choose a name for the drive and pick a file system from the dropdown.
7. Click Erase or OK to confirm.

A small drive finishes in under a minute. A large external hard drive can take several minutes. Don’t unplug it while formatting is in progress, since that can corrupt the drive and force you to start over.

Which File System Should You Pick?

ChromeOS gives you a choice between two formats, and the right one depends on what else you’ll plug the drive into.

• FAT32. The safest default. Every operating system reads and writes it, including Windows, macOS, Linux, Android, and most cameras and game consoles. The only real downside is a 4GB limit on individual file sizes, which matters if you’re moving large video files.
• exFAT. Works on every modern operating system and has no file size limit, making it the better pick for large video files or drives over 32GB. Some older devices, like certain digital cameras and car stereos, don’t support it.

ChromeOS can’t format a drive to NTFS, the format Windows uses by default for internal hard drives. If you specifically need NTFS, format the drive on a Windows computer instead. Chromebooks can still read NTFS drives, just not create them.

If the Format Option Is Greyed Out or Missing

This usually means the drive has a partition layout ChromeOS doesn’t recognize, common on drives that were previously set up for Linux or a Raspberry Pi.

1. Open the Chrome Web Store and install the Chromebook Recovery Utility extension.
2. Open the extension and click the gear icon in the top right.
3. Select Erase recovery media.
4. Choose your drive from the list, then click Continue, then Erase now.
5. Once that finishes, open the Files app and try Format device again. It should now work normally.

Good to Know

• Always eject a drive properly before removing it. Click the eject icon next to the drive’s name in the Files sidebar.
• Reformatting a drive every so often can help restore read and write speed on hard disk drives with moving parts, since fragmentation builds up over time. Flash-based USB drives and SD cards don’t have this problem.
• If you’re preparing a drive specifically to share between a Chromebook and an older device, like an older car stereo or camera, check that device’s manual for which file system it actually supports before formatting.

Frequently Asked Questions

Will formatting fix a corrupted SD card?
Often, yes. Formatting clears the file system completely. If the card has a physical hardware fault rather than a software-level corruption issue, formatting won’t help and the card will likely show errors again soon after.

Can I format an SD card being used as a Chromebook’s storage expansion?
That’s a different process from formatting a removable drive, and it depends on your specific Chromebook model’s support for it. Check your device’s settings under Storage management to see if that option is available.

Do I need to install anything to format a drive?
No, for standard formatting. The Chromebook Recovery Utility extension is only needed for the rare drives that won’t format normally due to an unrecognized partition.

Why is my drive read-only after formatting?
Some SD cards have a small physical lock switch on the side. Slide it to the unlocked position and try again.

Formatting a drive on a Chromebook takes a few clicks and no extra software for almost every case. FAT32 covers the widest range of devices, exFAT handles larger files better, and the Recovery Utility trick rescues the rare drive that won’t format the normal way.