I live at approx 7000' in the Sierra Nevada mountains of California, and
very frequently spend time over 10,000'.
I've noticed that nearly everbody in our town has a cranky or dead ipod.
When a strong Sierra storm rolls through, the lowered air pressure gives
us an effective altitude of nearly 9000'. I've noticed a strong coorelation
between blizzards here and dead drives an iPods.
I spoke with a friend in Leadville, CO (12,500') and he claims they flat don't
work at his altitude. Also many reports can be found via google of people's
iPods not loving the tops of ski areas (Breckenridge goes to like 13,800').
I know most planes are pressurized... but... Would be nice if stock drives were
happy at 15,000' - there's no real way to locally increase the air pressure around
the drive, and the thinner air brings the head closer to the platters.