Abstract: A test fixture apparatus for testing drives of magnetic recording media; the apparatus being adapted to simulate magnetic media for insertion within a magnetic recording drive. The test fixture apparatus includes a structure formed with exterior dimensions approximating those of the magnetic media; one or more conductors positioned to be in close proximity to the gap or gaps of the magnetic recording head within the drive when the test fixture apparatus is inserted; signal detection and driver circuitry to drive the conductor or conductors in order to simulate readback flux reversals and to check write characteristics of the drive; and means to simulate index pulses for flexible disk applications. A magnetic data cartridge application is also included as an alternative embodiment.