How to Give a drive a health check >

Mac Format - - FEATURE -

1 Open Disk Util­ity

Disk Util­ity lives in Util­i­ties within the Ap­pli­ca­tions folder. As usual, the quick­est way to reach it is to press ç+[ space­bar] to open Spot­light and start typ­ing its name. Its side­bar shows all the drives con­nected to your Mac, in­side and out.

2 View de­vices/vol­umes

By de­fault, you see ‘vol­umes’, log­i­cal spa­ces for stor­ing files (like Mac­in­tosh HD). If you want to see which phys­i­cal drives they’re on and those drives’ struc­tures, pick View > Show All De­vices (or press ç+2; ç+1 shows vol­umes).

3 Your startup disk

Whether your startup disk is an in­ter­nal or ex­ter­nal drive, se­lect­ing it on the left dims out the Erase, Re­store and Un­mount op­tions. You can run First Aid, but re­pairs may need you to use Disk Util­ity in macOS Re­cov­ery (see page 25).

4 Run First Aid

On other drives, First Aid just asks for con­fir­ma­tion be­fore start­ing its checks, which can take a minute or two. It’ll au­to­mat­i­cally re­pair any mi­nor is­sues that it finds and warn you if any prob­lems are found that it can’t fix.

5 Disk per­mis­sions

Un­til OS X Yosemite, there was an op­tion to ver­ify disk per­mis­sions, which could clear up prob­lems such as changes to macOS fail­ing to ‘take’ or apps not open­ing. These don’t oc­cur now; macOS is meant to deal with them as it goes.

6 Time to erase

If First Aid can’t re­pair er­rors on your startup disk, see page 25. For any other drive, se­lect an empty drive and use Re­store to copy con­tents to it. Erase the prob­lem­atic drive and try us­ing it, but keep an eye on it for fail­ing health.

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