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• #How to reformat mac air mac os

Options button, check the button for Zero Data and click onĮrase button.

#How to reformat mac air mac os

Set the format type to Mac OS Extended (Journaled.) Click on the

Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Partition button and wait until the volume(s) mount on the Desktop.Ĥ. Set the number of partitions from the dropdown menu (use 1 partition unless you wish to make more.) Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID (only required for Intel Macs) then click on the SMART info will not be reported on external drives. If it does not say "Verified" then the drive is failing or has failed and will need replacing. Note the SMART status of the drive in DU's status area. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger or Leopard.)Ģ. After the installer loads select your language and click on theĬontinue button. If you need to reformat your startup volume, then you must boot from your OS X Installer Disc. Open Disk Utility in your Utilities folder. Steps 4-6 are optional but should be used on a drive that has never been formatted before, if the format type is not Mac OS Extended, if the partition scheme has been changed, or if a different operating system (not OS X) has been installed on the drive.Īfter formatting is completed quit DU and return to the installer where you can complete the OS X installation.You will need an external USB drive and the original OS X Installer Discs that come with the computer.ġ. The format process can take up to several hours depending upon the drive size.

You will need an external USB drive and the original OS X Installer Discs that come with the computer.ġ.