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<blockquote data-quote="MacInWin" data-source="post: 1836185" data-attributes="member: 396914"><p>@krs, it depends on your interface speed to the external drive. Trying to run any operating system over USB2 was just pig-ugly. USB3 is better, 3.1 even more so. TB made it almost acceptable, TB2 got better. I don't have TB3 drives, so I can't say for them, but from the technology, it should be really pretty good. </p><p></p><p>I'm no bootcamp expert, but can you use Bootcamp to put Windows on an external drive? I thought it had to be in a partition of the internal drive? In any event, Windows will create cache on the boot drive and the I/O to that cache will be whatever the interface speed is. On the old machine Quilica is talking about, I suspect it's USB2, which will bring in the pig-ugly again. Plus, depending on the application in use, there may be scratch space on the boot drive, which will vary from app to app. Finally, if the memory gets full and swapping starts to happen, that all goes to the boot drive, so even more I/O to contend with. </p><p></p><p>Firewire 800 and USB3 were sort-of ok, particularly if your boot internal drive was a slow spinner and the external was either a really fast spinner or an SSD. I have four virtual machine images (Win10, Win7, Mojave, and Ubuntu) that run in Parallels. I tried them on external SSD drives with USB3.0 and found that they were just too slow for my taste that way. I moved them to the internal SSD and now they are pretty snappy.</p><p></p><p>Of course, YMMV.</p></blockquote><p></p>
[QUOTE="MacInWin, post: 1836185, member: 396914"] @krs, it depends on your interface speed to the external drive. Trying to run any operating system over USB2 was just pig-ugly. USB3 is better, 3.1 even more so. TB made it almost acceptable, TB2 got better. I don't have TB3 drives, so I can't say for them, but from the technology, it should be really pretty good. I'm no bootcamp expert, but can you use Bootcamp to put Windows on an external drive? I thought it had to be in a partition of the internal drive? In any event, Windows will create cache on the boot drive and the I/O to that cache will be whatever the interface speed is. On the old machine Quilica is talking about, I suspect it's USB2, which will bring in the pig-ugly again. Plus, depending on the application in use, there may be scratch space on the boot drive, which will vary from app to app. Finally, if the memory gets full and swapping starts to happen, that all goes to the boot drive, so even more I/O to contend with. Firewire 800 and USB3 were sort-of ok, particularly if your boot internal drive was a slow spinner and the external was either a really fast spinner or an SSD. I have four virtual machine images (Win10, Win7, Mojave, and Ubuntu) that run in Parallels. I tried them on external SSD drives with USB3.0 and found that they were just too slow for my taste that way. I moved them to the internal SSD and now they are pretty snappy. Of course, YMMV. [/QUOTE]
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