A ramp having a surface hardness of 2.6 GPa or more, which is obtained by molding a polyacetal resin. Such a ramp made of a polyacetal resin is excellent in moldabilities, and an abrasion loss at the resin portion of the ramp is remarkably small when a hard disk is operated. Thus it is suitable as a ramp for housing and guiding a head within a hard disk drive.

 
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> Magnetic tape cartridge, magnetic tape drive for recording, and magnetic tape drive for reproducing

> Positioner for a disk drive that offsets the resultant force at the actuator hub to precisely position a data transducer
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