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HyperDrive-C ®
Shimano's buzzword for compact drive. Specifically, this refers to cassettes which feature an 11 tooth sprocket, and the bodies designed to accommodate them.
Due to clearance problems, the cutaway between the splines on 11-tooth sprockets only goes halfway through the sprocket. The matching splines on HyperDrive-C bodies don't go all the way to the outer end of the body.
HyperDrive "C" body Non-compact body
You can use HyperDrive-C cassettes on conventional bodies by adding a 1 mm thick spacer to the body before installing the cassette. This is a standard spacer commonly used for fine-tuning chainline with conventional freewheels. It may be necessary to add a spacer to the right side of the axle in some applications.
More information on Hyperglide cassettes is available in a separate article on this site.
