Log in Sign up Terms of Use We use cookies to make wikiHow great.To create this article, volunteer authors worked to edit and improve it over time.The former option can help ensure that the USB drive is made fully compatible with your Mac, since most USB drives are preformatted for Windows computers by default.
Your USB drive will now be formatted and ready for use on your Mac computer. By continuing to use our site, you agree to our cookie policy. Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker. If you really cant stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. Select a security option and click on OK and then on Erase to start the erase and format process. I recently needed to format an external 5TB Seagate Backup Desk Media USB hard drive.So, I decided to use the Disk Utility application, which is included in Mac OS X. Format A Usb Drive How To Erase AndThis post describes the how to erase and format a USB Drive on Mac OS X and also addresses a particular error scenario I encountered. ![]() Here, I have connected a Seagate 5TB external USB hard drive, which I want to erase and format. If the device can not be mounted, it may be currently formatted using a file system format that is not supported by Mac OS X or the drive can not be read for some other reason. In this case, you can continue by launching the Mac OS X Disk Utility application. In the Disk Utility application, select the hard drive that you want to erase and format. Please note that all data on that drive will be permanently deleted once you start the erase and format process. If your hard drive does not show up by its name in the left-hand side list as shown above and you select a disk instead when clicking on Erase, you may get an error as shown in the following screen shot. When clicking on Show Details, an error, saying that there is not enough space on the device, or similar, may be shown. MediaKit reports not enough space on device for requested operation. Use the list view icon in the upper right-hand corner of the Disk Utility application and switch the view to Show All Devices. The external USB storage device should now be listed by its name, select it and click on Erase to continue.A new dialog will appear. It allows you to enter a name for the external USB drive and to select a format. Leave the Scheme to GUID Partition Map, unless you specifically need a different one or want to make the drive bootable. By default, the drive will be erased using the fasted, most unsecure method. ![]() If you plan to sell this drive or need to permanently delete sensitive data, make sure to use a more secure erase method. The Security Options dialog provides four options, ranging from Fastest to Most Secure. A disk recovery application may be able to recover the files. It erases the information used to access your files and writes over the data two times. It writes 2 passes of random data followed by a single pass of known data over the entire disk. It erases the information used to access your files and writes over the data 3 times. It erases the information used to access your files and writes over the data 7 times.
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