FOUR READ AND WRITE HEADS ON A DRUM ARRANGED TO PREVENT OVERLAPPING OF TRACING PERIODS

摘要

A rotary drum magnetic storage apparatus as four magnetic heads fixed above the periphery of the drum. Two of the heads are read heads and the other two heads are write heads. A magnetic tape contacts the periphery of the drum at a specific contact angle. The rotary drum of the magnetic head is of the small type that is less than 30 mm. To avoid overlapping of tracing periods of the heads of the storage apparatus during operation, there is a specific relationship fixed between the write heads, the read heads and the contact angle the magnetic tape makes with the drum.