US 12,322,422 B1
Servo-write for magnetic disk media archival data storage system
Toshiki Hirano, San Jose, CA (US); Guoxiao Guo, Irvine, CA (US); and Ian R. McFadyen, San Jose, CA (US)
Assigned to Western Digital Technologies, Inc., San Jose, CA (US)
Filed by Western Digital Technologies, Inc., San Jose, CA (US)
Filed on Mar. 5, 2024, as Appl. No. 18/596,225.
Int. Cl. G11B 5/54 (2006.01); G11B 5/55 (2006.01)
CPC G11B 5/5543 (2013.01) 19 Claims
OG exemplary drawing
 
1. A magnetic read-write device comprising:
a first magnetic disk medium rotatably fixed to a disk spindle;
a first head slider housing a first read-write transducer configured to read from the first magnetic disk medium;
a second head slider housing a second read-write transducer configured to read from and to write to a single removable second magnetic disk medium;
an actuator configured to move the head sliders to access portions of the respective first and second magnetic disk medium; and
electronic controller circuitry storing or accessing one or more sequences of instructions which, when executed by one or more processors, cause performance of:
while the first read-write transducer is servo-positioning from a master servo pattern from the first magnetic disk medium, the second read-write transducer servo-writing a product servo pattern, based on the master servo pattern, to the second magnetic disk medium; and
after the second magnetic disk medium is turned over and removably secured to the disk spindle such that an opposing surface of the second magnetic disk medium is operationally accessible by the second read-write transducer, while the first read-write transducer is servo-positioning from the master servo pattern from the first magnetic disk medium, the second read-write transducer servo-writing a product servo pattern to the opposing surface of the second magnetic disk medium.