G - Physics – 11 – B
Patent
G - Physics
11
B
340/70, 352/10.5
G11B 15/02 (2006.01) G11B 5/00 (2006.01) G11B 5/012 (2006.01) G11B 5/09 (2006.01) G11B 19/02 (2006.01) G11B 23/28 (2006.01) G11B 33/10 (2006.01)
Patent
CA 1220547
METHOD AND APPARATUS FOR AUTHENTICATING MEMORY DISK ABSTRACT A technique for enabling authentication of a magnetic memory disk. Predetermined portions of preselected tracks on the disk recording surface are deliberately removed and the locations of the modified portions are recorded, along with an initial program routine. The portions are alternatively removed by mechanically abrading the recording surface using a stylus, by embossing the preselected portions and applying an abrasive member to the embossed raised surfaces, by burning off the portions with a laser, or by chemical etching. When the disk is inserted into a drive, an initial program routine recorded on the disk causes the drive transducer to seek the pretreated portions and attempt a write and subsequent read operation. A successful write/read operation indicates a counterfeit copy. This indication may be used to signal the operator or erase the entire program from the disk. DDDDD1/5506-28
439033
Juracich John G.
Winkler James L.
Dysan Corporation
Kirby Eades Gale Baker
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