I ordered a 512GB mSD card w/SD adapter & it got to me within a business week from over east to "other side of the world" WA- lol. That's a plus. I tested the card in an OLD Emachine PC I was reinstalling/upgrading with an SSD. I honestly didn't think the card reader would recognize it, but it did! I copied some files to it- no issues. My "plan", though, is to slide this into an old iMac I was given to use as fast-ish storage. I boot the iMac from the Samsung T5/250GB & it's pretty responsive compared to the dinosaur 3.5" HDD inside that beast (which heats up like an oven if it's accessed!). So, that T5 (OSX) + this mSD 512 (storage) is the golden ticket to a cheap and fast iMac- FYI!