Disk storage apparatus having signals recorded in a specific format
Apparatus for selective retrieval of information streams or items
Magnetic tape cassettes provided with memory circuits for storing information
Control apparatus for rotation type storage device Patent #: 4507693
ApplicationNo. 06/627238 filed on 07/02/1984
US Classes:360/78.04, For rotary carrier (e.g., disc)360/135, Disk360/69AUTOMATIC CONTROL OF A RECORDER MECHANISM
ExaminersPrimary: Stellar, George G.
Attorney, Agent or Firm
International ClassG06F 3/06 (20060101)
AbstractA multiple system data storage disk adapted for use with more than one type of computer. The disk is specially formatted to include software for each computer. The disk includes four discrete recognition headers, one for each target computer, placed at locations on the disk where each computer expects to being its data loading operation. Each header further includes software directing the computer to step out to a discrete group of data tracks located elsewhere on the disk. Each data track group contains an identical program, written in each target computer's language. The disk is suited to video games for multiple computers. An alternative embodiment of the disk includes a header or headers containing a magnetic signature for copy protection. A disk can be produced with twenty-four such headers, one for each type of computer on the market, which can be mass produced to provide low-cost copy protection for all machines.