Why-oh-why does Apple have to poll a flash drive 3 or 4 times a second? If you have an R/W LED on your flash drive, its like a beacon in the night 24/7. Tried it on Imac and MacBook Pro under Mavericks and Yosemite same result, continuous flashing. Not only is it distracting, but as most of us know, Flash Drives have a finite life based on the number of R/W cycles. It would appear Apple is running a test to see which drive can last the longest and take the most punishment! Apple Tech Support says "That's the way it is, but we will have our engineering group look at it".....yeah right! My guess is that their fix may be a 1/2" length of masking tape! Anyone else suffering the same malady or know of a fix?