Bullets are not known for their rugged construction; in many cases it's considered desirable if the bullet breaks up on impact so it can dump its kinetic energy more efficiently. Devices that are intended to operate at 72K RPM and above are certainly practical. Many of the machines I work with have turbomolecular pumps that operate in that speed range, and their diameter is larger than a disk drive so the force is larger as well. Similarly, ultracentrifuges operate at substantially higher speed than that- they can go above 100K RPM- without exploding. The thing they have in common is that they operate under vacuum to minimize friction. I suspect an ultra-high speed disk drive would need to do the same. As long as the vacuum is maintained, they would probably be pretty quiet. The motors would tend to give off a ~1200 Hz (e.g. 72K cycle per minute) whine.
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