How to For­mat a drive

Mac Format - - MACOS SKILLS -

1 The View menu

Disk Util­ity’s side­bar groups items as in­ter­nal or ex­ter­nal drives, or disk images. In High Sierra it can be set to show just vol­umes, or all de­vices with their vol­umes in­dented below. Choose View > Show All De­vices.

2 APFS el­i­gi­bil­ity

To use APFS on a drive, it must use a GUID par­ti­tion map. Se­lect the drive in the side­bar and look next to Par­ti­tion Map in the sum­mary to the right. If it doesn’t say GUID, first back up the drive’s con­tents else­where.

3 Par­ti­tion as GUID

Se­lect the drive, click Erase in the tool­bar, pick GUID as its scheme, and set its for­mat to APFS or APFS (En­crypted) – the lat­ter asks you to set a password; record it in a se­cure place. Set a name, then click Erase and wait.

4 Erase as HFS+

To use the drive on Macs with Sierra or an older sys­tem ver­sion, you should choose ‘Mac OS Ex­tended (Jour­naled)’ – note that an en­crypted ver­sion of this is only of­fered as an op­tion if the drive is us­ing GUID.

5 In- place en­cryp­tion

If your drive al­ready has a GUID par­ti­tion map and is in APFS or Mac OS Ex­tended for­mat, but is not en­crypted, you can ap­ply en­cryp­tion with­out eras­ing it. Back up its con­tents first, though. In Finder, pick Go > Com­puter.

6 Be­gin en­cryp­tion

Hold ≈, click the drive’s icon, and choose En­crypt. Pro­vide a password, then click En­crypt Disk. You can check progress and later de­crypt the drive from that menu, too. You can use your Mac while the drive en­crypts.

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