Nowadays, when you buy a USB drive, you can use it right out of the box with your Mac. However, unless it’s been designed for use with a Mac, it won’t be formatted using macOS’ preferred file system (either Mac OS Extended or APFS, depending on which version of macOS you’re running). That’s because most of the computers in the world run Windows, and Windows uses a different file system, usually one known as Fat32. Drives formatted as Fat32 can be read from and written to by macOS, but it’s not optimal and you’re more likely to run into problems than if you use macOS’ native format. So, if you’ve bought a USB drive that’s formatted as Fat32, or any other format other than Mac OS Extended (also known as HFS+) or APFS, here’s how to format a USB drive on Mac. It’s exactly the same procedure if you need to reformat a flash drive on a Mac.

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How to format a USB drive on a Mac 1. Plug the drive into a USB socket (if you have a recent MacBook or MacBook Pro that only has USB-C connectors, you’ll need a USB-C to USB-A adaptor).

Open a new Finder window and click on the drive. Make sure it has no files on it that you need.

The process of reformatting it will wipe all the data from it. Once you’ve copied any files you need from the USB drive to your Mac, go to Applications>Utilities and double-click on Disk Utility. Click on the USB drive in the sidebar and then choose Erase from the toolbar at the top of the window. In the window that drops down type a name for the formatted drive in the box next to Name.

Thus, the exFAT file system is optimal for usb flash drives formatting. NTFS is not supported in Linux and requires the installation of third-party applications to mount usb storage on Mac. ExFAT, on the other hand, is supported in Snow Leopard and later versions of Mac OS while Linux also requires. Apr 03, 2011  If you use your USB-stick only on Macs you will want to reformat it to HFS+ which allows (virtually) unlimited file sizes, longer file names and some Mac specific things. And it is also much saver in terms of data loss (see footnote).

Choose a format from the dropdown menu. If you have previously stored sensitive data on the drive, click the Security tab. Choose a security level using the slider. The further to the right you move the slider, the more ‘passes’ the erase tool will make and the more securely files will be deleted. However, it also increases the time it takes to format the drive quite considerably.

Click Ok then click Erase. Tip: You don’t need to erase a whole drive to delete files securely. If you have confidential files or sensitive data you need to remove from your Mac completely, you should use File Shredder. It’s specifically designed to securely delete sensitive data and will render it unrecoverable. You can download CleanMyMac X for free.