Many moons ago the company I worked for sold rebadged versions of the CDC Storage Module Drive (SMD), an 80MB version and a 40MB version. Customers could buy the 40MB version and upgrade to the 80MB later, for many thousands of pounds.
The only difference between the two was that the 40MB version had a push-fit plug attached to the underside of the PCB cage that jumpered a few of the through-hole pins so that it only used alternate tracks on the platters. Changing from one to the other was a case of replacing the 40MB plug with one that said 80MB on the side. It took longer to spin the disk down and back up again than to change the plug.
Engineers got quite inventive trying to drag the job out to a couple of hours.
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