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They probably have a concern with an external that you can disconnect it, and how would the drive work if all the sudden you disconnected the external drive and most of the things that you think are on your one "fusion drive" just disappear because they are in reality on the external.
#EXTERNAL HARD DRIVE FOR MAC REVIEWS SOFTWARE#
Now, people have been asking "can I just by a mac with an SSD and use an external hard drive and have it work like a fusion drive?" The answer is no because apple did not write the software to do that. You won't see any moving because in the operating system you'll just see it's just one big drive. The "fusion drive" is in reality two physical drives inside of the computer: a traditional spinning hard disk and a small "Solid State Drive" software will make one logical drive and will "intelligently" move the things that you use the most to the faster (but smaller) SSD drive. In this case you have 1 physical drive, but the computer sees 3 logical drives. You can partition a drive into multiple parts, so you can have one 2TB hard disk but make a 500GB partition for Windows files, 1 TB for Mac files, and another 500GB to keep private files. Physical is the actually drives: the internal SSD, the internal hard disk, the external hard disk.
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The "Volume" is a "logical drive." In computing you have "physical" and "logical" drives. It just won't be part of the merged "fusion drive" and it won't be quicker. In short: You can still use an external drive, just like any other computer.
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