Having spent a lot of time trying to create this with my iMac, my experience is that it is very difficult, and a long, slow way to pain and grief. Start up from the internal drive, and you might be running Sierra start from an external drive and you might be running High Sierra. It used to be that many Mac users, who needed to check their work with both the last and current releases of macOS, ran dual-boot systems. Dual-boot Sierra and High Sierra systems are a nightmare You could end up having to restore everything if the conversion goes wrong.Ģ. That seems to have generally gone smoothly on such simple systems, although there is a very real risk of problems and you must ensure that you have at least one really reliable backup. Upgrading a Mac’s internal SSD will – you have no option – convert that from its current HFS+ file system to Apple’s new APFS. The further your Mac departs from that, the more likely you are to hit problems. If you’re upgrading a recent MacBook Pro with an internal SSD and little else attached to it, then the upgrade should be a breeze. Having spent much of the last day installing and reinstalling High Sierra, I offer the following tips for anyone who might be tempted to upgrade.
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