An anonymous reader writes "Every 3-6 months, we see an announcement about something adding to hard disk storage. However, tape drives don't seem to be improving on anywhere near the scale of hard disks.
Why is this? Both are magnetic media, and with a tape drive, a manufacturer has far more space to put data on than the platters of a hard disk, and still leave plenty of space for error correction data. Tape drives also don't spin nearly as fast as hard disks, so tolerances involved can be less."