HOW TO Set up a Fu­sion Drive

Mac Format - - FEATURE -

1 Prepara­tory mea­sures

Back up ev­ery­thing, and de­tach all ex­ter­nal drives you don’t want to use in the Fu­sion Drive; any vol­ume used will be erased. Con­nect your SSD and open Ter­mi­nal; if you’ll add your startup disk, start up in Re­cov­ery (hold ç+R) first.

4 Cre­ate a vol­ume

The com­bined drive looks to OS X like a reg­u­lar blank one, so you need to cre­ate a vol­ume on it by en­ter­ing the fol­low­ing, re­plac­ing xxx with what you just copied: disku­til cs cre­ateVol­ume xxx jhfs+ "Macin­tosh HD" 100%.

2 Iden­tify com­po­nents

En­ter disku­til list to iden­tify the vol­umes to use. Though they’re easy to dis­cern in Finder, you’ll need to re­fer to them by what’s listed un­der Iden­ti­fier. For us, that’s /dev/disk0s2 (our startup disk) and /dev/disk2s2 (our SSD).

5 About that com­mand

The pre­vi­ous com­mand set the new vol­ume to oc­cupy 100% of the avail­able space, erased it with an OS X Ex­tended (Jour­naled) file sys­tem, and named it Macin­tosh HD. The com­bined drives now ap­pear as one in Finder.

3 Bind the two parts To cre­ate a merged stor­age de­vice, en­ter: disku­til cs cre­ate BootDrive

/dev/disk1 /dev/disk2. Disk Util­ity ap­plies the re­quired set­tings and gives it a Log­i­cal Vol­ume Group Name – copy that to the Clipboard for the next step.

6 In­stall or re­store OS X

You can now in­stall El Cap­i­tan on your new Fu­sion Drive (or re­store your Time Ma­chine backup to it). OS X will man­age the process of en­sur­ing the most used data is kept on the SSD and other stuff goes on the hard disk.

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