![]() If the Security Options button is not available, Disk Utility cannot perform a secure erase on the storage device. Secure erase options are available only for some types of storage devices. (Optional) If available, click Security Options, use the slider to choose how many times to write over the erased data, then click OK. If the Scheme pop-up menu isn’t available, make sure you selected the storage device you want to erase-it’s at the top of the hierarchy.Ĭlick the Format pop-up menu, then choose a file system format. Ĭlick the Scheme pop-up menu, then choose GUID Partition Map. In the sidebar, select the storage device you want to erase, then click the Erase button. ![]() ![]() Warning: The contents of the drive will be erased when you click Format Disk. If Windows says that it doesn’t recognize the drive (and you’ve already backed up any data on it), click Format Disk, and then skip the next step. MacDisk is a 32-bit application and runs under all recent versions of Windows (Vista and 7/8/10 included, even 64 bits). If you want to erase any other type of storage device: Double-click Disk Utility in the /Applications/Utilities folder. First, plug the USB drive that you’d like to format as a universal Mac/Windows drive into your Windows machine. MacDisk is an utility for reading, writing and formatting Apple Macintosh magnetic media on an IBM compatible PC, without any hardware modification of the computer and without any add-on. Note: On newer Macs you might have to install an EFI boot manager to boot from USB. No matter under which circumstance you need to use an external storage device on your Mac, you may want your Mac external drive to be formatted with the best file system to make it to be recognized on your Mac and maximize the best performance. Restart your Mac and hold down Alt while the Mac is restarting to choose the USB stick. Run diskutil eject /dev/diskN and remove your flash media when the command completes. Note: If you want to get your Mac ready to trade in, sell, or give away, and your computer is a Mac with Apple silicon or an Intel-based Mac with an Apple T2 Security Chip, use Erase Assistant. Share What to Know Connect the USB drive, go to Disk Utility, select the drive, and go to Erase > Mac OS Extended (Journaled) > Erase > Done. Start Disk Utility.app and unmount (dont eject) the drive. ![]()
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