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If anyone has ever taken HDD's apart you will understand why vertical or horizontal makes no difference. You will see that the arms that hold the heads are spring loaded and actually press the teflon "bearing" surrounding the head against the platter. When the platter spins up to speed the bearing floats on a microscopic thin layer of air but when the platter spins down the teflon bearing lands on the platter. The head is in side the teflon and never touches the platter.
Also the fluid in the spindle and head bearings won't run down to the bottom of the bearing if vertical because the bearing is full of fluid. Take a half empty bottle of water and put the lid on and turn it upside down and the empty space moved to the top as the fluid goes to the bottom. Now fill the bottle completely to the top and put the lid on and turn it upside down and since there was no empty space before there is no empty space now.
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