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.
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Drive Partition and Format - El Capitan or Later. Open Disk Utility in the Utilities' folder. After Disk Utility loads select the drive (out-dented entry with the mfgr.' S ID and size) from the side list. Click on the Partition tab in the Disk Utility toolbar. A new window will open with a pie chart of existing partitions. Question Audio from monitor connected to Macbook Air: Question MacBook Pro (13', Mid 2012, MD101LL/A): Questions before I buy: Question MacBook Air 2020 vs MacBook Pro 2020: Question Buying a Macbook Air or Pro: Looking for personalized processor, rAM, and storage recommendations? Question Is there an adapter for a macbook air ssd? Format the MacBook Air USB Restore Key. I got it working I had all those same errors too. First of all extract all the files on to your desktop and that’s solves some of the first problems.
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 or startup volume: Start up from macOS Recovery, then choose Disk Utility from the macOS Utilities window.
If you want to erase any other type of disk or volume: Double-click Disk Utility in the /Applications/Utilities folder.
Final draft 11 1 17. 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 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.
Writing over the data three times meets the U.S. Department of Energy standard for securely erasing magnetic media. Writing over the data seven times meets the U.S. Department of Defense 5220-22-M standard.
Click Erase, then click Done.
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.
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See alsoApple Support article: How to erase a disk for MacPartition a physical disk in Disk Utility on MacFile system formats available in Disk Utility on MacFormat a disk for Windows computers in Disk Utility on MacEncrypt and protect a storage device with a password in Disk Utility on Mac