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Disk Utility User Guide
- How to Reformat a Jump Drive on a Mac. A jump drive, or USB flash drive, offers convenient portability to your data. Many of these drives offer a key-ring attachment hole, so you will never be without your data. For school or work projects, this portability means you can work from home, work or lab computers while.
- To format a flash drive on a Mac, plug in the drive and open the 'Applications' folder, the 'Utilities' folder and then 'Disk Utility.' Your flash drive should be listed in the left menu.
In Disk Utility on Mac, you can erase and reformat storage devices to use with your Mac. Erasing a storage device deletes everything on it.
If you have any files you want to save, copy them to another storage device.
Open the Disk Utility app on your Mac using one of the following methods, depending on the type of disk or volume you want to erase:
If you want to erase your startup disk: Start up from macOS Recovery, then choose Disk Utility from the Recovery window.
If you want to erase any other type of storage device: Double-click Disk Utility in the /Applications/Utilities folder.
Choose View > Show All Devices.
In the sidebar, select the storage device you want to erase, then click the Erase button .
Click the Scheme pop-up menu, then choose GUID Partition Map.
Click the Format pop-up menu, then choose a file system format.
Enter a name.
(Optional) If available, click Security Options, use the slider to choose how many times to write over the erased data, then click OK.
Secure erase options are available only for some types of storage devices. If the Security Options button is not available, Disk Utility cannot perform a secure erase on the storage device.
Click Erase, then click Done.
Format Flash Drive On Mac
Note: With a solid-state drive (SSD), secure erase options are not available in Disk Utility. For more security, consider turning on FileVault encryption when you start using your SSD drive.