But is it at YouTube scale? I just tried it, I can click 10 years old videos with ~10 views and it starts playing after 3 seconds. How does that work? How can you have ever video ever uploaded on hot storage? What kind of storage are they using? Flash is probably too expensive, even if it has higher density than spinning disks by today. So was that video on a spinning disk? Then it also didn't seem to have been some spun down disk, because it should have taken more than three seconds then. It just boggles my mind that every video ever uploaded to YouTube is ready to be accessed instantly. You think anything that hasn't been accessed in a few years should be tugged away on some tape somewhere and needs a minute or two to start playing