Thun­der­bolt startup

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I have two Thun­der­bolt ports on my 27-inch iMac, which I be­lieve can run Thun­der­bolt 1 and 2 de­vices. How do I set up a Thun­der­bolt-con­nected SSD as my Mac’s startup disk?. Gi­a­como Palucci This is a great way to speed up a Mac with lit­tle ef­fort, though it’s costly. If you’ve al­ready bought a Thun­der­bolt SSD, start by eras­ing it in Disk Util­ity, mak­ing sure it has a GUID par­ti­tion scheme and uses theMac OS Ex­tended (Jour­naled) for­mat.

Get the macOS in­staller from the Mac App Store and when it asks you to choose a des­ti­na­tion, pick the ex­ter­nal SSD, of course. You’ll end up with a clean sys­tem this way.

Al­ter­na­tively, make sure you have a com­plete backup in Time Ma­chine of your Mac’s in­ter­nal startup disk, start up in macOS Re­cov­ery – hold ç+r at the startup sound – and use the Time Ma­chine op­tion there to re­store to the freshly for­mat­ted SSD. This will put a copy of your ex­ist­ing sys­tem on the speedy drive. If your Mac doesn’t restart in the re­stored sys­tem, choose

> Startup Disk, pick the SSD, and then restart.

If you haven’t bought a Thun­der­bolt drive al­ready and your Mac has USB 3, you can save a lot of money and still get good per­for­mance from a USB 3 en­clo­sure with a bare SSD in­stalled in it. The most af­ford­able Thun­der­bolt “en­clo­sure” we’ve used, which is no longer on sale, was still about $100. We’ve used the USB 3.0 ver­sion of this $20 op­tion to try out macOS be­tas in the past: bit.ly/sten­clo­sure.

Hold å af­ter pow­er­ing on your Mac to pick a startup disk.

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