Click to expand.Thanks. That wasn't really my question - I suppose I should have worded it differently.
What one hopes for when they ask questions on a forum are sufficient details. The one thing that I find occurs often on Macrumors, is that everyone gives a veiled answer to every question and if the geniuses who do answer questions would just cover all the angles, it would help. Here's the question I should have ask: Regardless of the internal drive speed, does the WD Passport USB 3 enclosure actually operate at USB 3 with the Mac, or does it work at USB 2 speeds because the Mac has some kind of weird compatibility problem with USB 3 devices. I've got a Mac Mini on the way so I'm quite interested in knowing if there's anything I should know. Another way of looking at the question is; is the bottleneck the drive, or is it a fall-back to USB 2 due to incompatibility? If it's the drive that's the bottleneck, then one can assume that there should be no noticeable lag or stuttering in the system caused by USB 3 utilization as there is with USB 2. Click to expand.Thanks for the link.
WD My Passport For Mac is a very popular and one of the more expensive options. It's in the top 3 bestselling external hard drives and has dozens of popular alternatives in the same price range, such as Glyph BlackBox Pro or WD Easystore Desktop. WD My Passport For Mac was released in 2015. There are a lot of newer external hard drives on the market.

There's a great review linked to also. It mentions some other concern I have I wanted to bring up - that there's essentially a virtual region of 185MB software which incidentally, as I've read (Amazon review), causes the passport to be incompatible with Linux. Can this region be wiped out and recovered? (I have not yet opened my drive - perhaps worth reselling). Is it this region that makes the drive a PC vs. A Mac - in other words, do the 'for mac' drives have different 'built-in' software?
Or can I truly just wipe the sucker clean and recover all 2TB? Click to expand.That sounds like a misunderstanding (?). At least on my 'for Mac'-version the software was a.dmg-file at about 55 MB in the root of the hard drive. I just deleted it after installing the software. Google chrome for mac os x. It autoupdates and if I need to install it again I can download it from WD's website.
Actually reading the review I linked to I see that the Windows software is the 185 MB and it is probably just a.exe or a.msi executable like the.dmg on the 'for Mac'-version. Even if it had a 'shadow' partition I can't imagine why it shouldn't work with Linux (long time Linux user here). Best regards, Nikolaj. That sounds like a misunderstanding (?).