The most durable DAP I've owned was a Sony Walkman. Not one of the new ones with the fancy displays, and flash memory. No no, this one had a small 20GB HDD in it, and the thing was a tank. Due to my absent mindedness it went through shit that I wouldn't dream of putting my current DAP through. They were built with the knowledge that they would be jostled. Laptops on the other hand, yeah, those thing shouldn't have HDD in them. ODDs, on the other hand, aren't too much of an issue. The problem with an HDD is if they fail mechanically, then the medium is as good as useless without some special equipment. ODDs on the other hand don't have this problem. If the drive breaks, the medium is almost certainly still good, unless you through the thing off the Empire State Building, in which case it may have Broken. The problem with ODDs is that aside from external storage, and software (games and videos) that big corporations like to pretend are like physical merchandise, they are useless.