To reduce the size of a read/write device, to eliminate the necessity for high precision in a magazine and in positional relationship between various parts, such as positional relationship between the magazine and its open/close mechanism, the invention calls for a magazine comprising an inner body and an outer body which can be moved in the direction in which disks are stacked, the inner body and the outer body thus opening and closing while they remain connected to each other. A plurality of disks stacked one atop another are contained in the magazine. Mechanisms provided at a side of the magazine release the inner body and the outer body from each other and move read/write disks CD in the direction in which the disk are stacked, thereby forming a space any two adjacent disks CD. A read/write unit is inserted into the space formed between read/write disks CD. By means of a driving system of read/write unit, a read/write disk CD which faces the space is rotated. By means of a laser pickup of read/write unit, data is read from or written onto rotating read/write disk CD.
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