> See that's the bit that's weird to me. My OS drives are small SSD's and the spinning platters are all comfortably full. You have to remember that you know wh

> See that's the bit that's weird to me. My OS drives are small SSD's and the spinning platters are all comfortably full. You have to remember that you know what you're doing. You know how much space you need and you know how to add more later, so you don't buy more than you need. The typical person buys a 2TB hard drive because they have "thousands of photos" and the 2TB drive is only $15 more than the 0.5TB drive, even though "thousands of photos" consume like 0.005TB. And they're rational to do it because they know they aren't good at predicting whether they will fill the smaller drive and it's worth $15 to hedge against the ordeal of adding more storage later. Which means many people will buy a 2TB drive and use it to store 75GB of data.