![]() By comparison, Thunderbolt is far clearer: for all modern Macs with Thunderbolt 3 or 4 ports, all certified Thunderbolt 3 or 4 devices used with certified cables should deliver consistently high transfer speeds.Ĭhoosing USB devices isn’t easy. You may have noticed that USB standards are a bit of a mess, and tricky even for experts to negotiate. Static storage of files which change little over time, which can include media libraries.Time Machine backups in Big Sur and later.There are, though, well-proven uses for external hard disks with APFS, including: The most extreme example is a startup disk: if you’ve ever tried booting Mojave or any more recent macOS from a hard disk, you’ll understand only too well. One exception to this is if you’re staying with Catalina or earlier and make Time Machine backups, which still require the older file system HFS+.ĪPFS is designed for SSDs, and in general use doesn’t work well on hard disks. Unless you’re still running macOS well before Mojave, you should aim to use Apple’s new file system, APFS, on your external storage. While huge music collections, Photos libraries and other bulk data are usually best kept on external storage, you should aim to have ample space for everything else on your Mac’s internal SSD for its whole lifetime. larger SSDs perform better than smaller ones.internal SSDs are far less likely to undergo thermal throttling, because they benefit from your Mac’s internal cooling.internal SSDs almost invariably perform better than the most expensive external SSDs.smaller internal SSDs are written to just as often, so they wear out more quickly.over time, your storage requirements will only increase, and that internal SSD will become fuller.Apple doesn’t discount the additional price of larger internal SSDs, and you might think that you can pay for a faster chip option or more memory from the savings you’ll make with a smaller internal SSD. One of the most common reasons for buying external storage is to reduce the initial cost of internal storage. Does APFS still work reliably on hard disks? Will the extra cost of USB4 bring faster speeds? What does USB 3.2 Gen 2×2 mean, and do my Mac’s ports support it? Let me try to make the choices a bit clearer. By now, you may be more than a little confused over which external storage you should buy for your Mac. ![]()
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March 2023
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