Oh, I obviously interpreted that as meaning a hard disk drive (which SSDs are still commonly referred to as HDDs) since we were discussing modern PCs. Many years ago external physical file transfer mostly transitied away from using actual spinning disks to USB storage, and even that has been mostly supplanted by network connected storage for several years.
No. You very obviously don’t know how bandwidth is handled for large providers. They don’t pay per gb, and instead have peering agreements with other networks. Google generally doesn’t have to pay these other networks, as Google has the web applications that the other networks’ customers expect to be able to use.