Memory device including a rotating disk and means for detecting change in frictional resistance between the disk and a read/record head

摘要

A memory apparatus which is comprised within a computer or adapted to a peripheral apparatus of computer and also comprises a rotary apparatus which rotates a disk as an information recording medium, a rotation detector which detects rotating position of which controls rotation of said rotary apparatus said disk, a rotation control apparatus based on detection result of such rotation detector, a head which records and/or reads information to be stored in said disk and arranged opposed to the information recording surface of said disk and a detecting element which is responsive to an operation command output to said rotary apparatus from said rotation control apparatus and detects a pulse interval of rotary pulse signals of said rotation detector during the period from input of operation command output to said rotary apparatus from said rotation control apparatus to completion of the operation of command content of said rotary apparatus.