I have a standard 13" Macbook Air - USB 3. I bought it in November of last year and have since upgraded to Yosemite, and have installed its upgrades as they have come along. I recently bought a USB thumb drive (a "SanDisk Ultra Fit™ CZ43 32GB USB 3.0 Low-Profile Flash Drive Up To 130MB/s Read- SDCZ43-032G-G46") on which I'm storing high def movies (mp4, mov, wmv). I'm getting very low transfer rates (today it took me an hour for a 2 gig file). I wanted to put a password on it, so I formatted it to Mac OS Extended (Journaled, Encrypted), and it is partitioned. May be of note: when I first got it, my USB ports weren't reading the drive (though it was receiving power, as its light was on), so I reset the SMC and that solved the problem. After I had this slow transfer problem I saw that that was one common solution, so I again reset both SMC and PRAM, to no effect. I've looked at several threads addressing this issue, none of which contained a solution which worked for me. Any advice?