This is ridiculous. Newer OS's are supposed to NOT create MORE problems. Especially new problems with things that always worked before without a hitch.
My internal drive hasn't worked for a good 6 months after adding a SSHD. So I bought an external Super Drive which I shouldn't have had to buy. Now with the Yosemite update, it doesn't work anymore either.
Apple...your losing it man. You are supposed to stand for ease of use, extension of oneself, enjoyment of your products. All you are doing as of lately is costing me tons of time and more money to fix things.
I hope someone comes up with a fix with this soon. I'm deployed and use the drive for my insanity/p90x workouts.