Reversible magnetic recording disk unit

Claim 1

A reversibly mountable magnetic record unit for a disk drive having a sensor for controlling information transfer to and from a selected side of a planar recording media comprising: a flexible circular planar disk having a pair of opposed faces, a central axis, a central circular opening and a hole through said disk radially spaced from said central axis, there being a coating of magnetic recording medium on each of said faces, whereby information in the form of magnetic signals can be magnetically read from and written onto either of said faces; a jacket, said disk being disposed within the jacket and being rotatable relative thereto, said jacket having a pair of opposed sides, each jacket side having a central circular opening and a pair of holes spaced from the central opening and symmetrically located relative to a diametral center line therethrough, said jacket being symmetric about said diametral center line, the holes of one jacket side being aligned with respective holes of the other jacket side to form two aligned hole pairs equidistant from said diametral center line, the hole in the disk being movable past and into successive alignment with each aligned hole pair to actuate the sensor when the jacket is in an operative position relative to the disk drive, each jacket side further having a slot therethrough radially aligned with said central opening and with each other along said diametral center line for permitting information to be magnetically transferred to and from a single selected face of the disk, said magnetic record unit being mountable to the disk drive in an obverse and a reverse position about said diametral center line.