Constitution-class vessels routinely carried a large number of entertainment tapes – more than other class vessels, including the Antares. (TOS: "Charlie X")
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In the final draft script of TOS: "The Naked Time", examples of this type of device were referred to as "tape cassettes", whereas, the final draft script of the next installment to be produced, "Charlie X", referred to them as "microtapes".
A deleted scene from "The Menagerie, Part II" established that, to lock the Enterprise on a course to Talos IV, Spock had jammed "the series 'seven' tapes." Hence, cross-circuiting that series of tapes could enable the starship to be returned to manual control. [1]
A behind-the-scenes sidebar in the Star Trek: The Next Generation Technical Manual(page number? • edit) expressed amusement that the original series' microtapes were roughly the same size and shape as the 3.5-inch floppy disks used in the production of that book decades later.
This device was described as "data square" in the audio description for "Ad Astra per Aspera".