Servo-write for magnetic disk media archival data storage system

A method of self-servo writing in a disk media storage device comprising a first disk medium fixed to a spindle, the method comprising:

• removably securing a single second disk medium to the spindle over the first disk medium;
• while a lower read-write transducer is servo-positioning from a master servo pattern from the first disk medium, an upper read-write transducer servo-writing a product servo pattern, based on the master servo pattern, to a first surface of the second disk medium;
• removing the second disk medium from the spindle;
• turning over the second disk medium;
• removably securing the second disk medium to the spindle such that an opposing second surface of the second disk medium is operationally accessible by the upper read-write transducer;
• and
• while the lower read-write transducer is servo-positioning from the master servo pattern from the first disk medium, the upper read-write transducer servo-writing a product servo pattern, based on the master servo pattern, to the second surface of the second disk medium.

A magnetic media data storage library comprising:

• a plurality of magnetic disk media;
• at least one disk storage area in which the disk media are housed;
• at least one read-write device (RWD) configured to write to and read from the disk media, the at least one RWD comprising:
• a first magnetic disk medium, of the plurality of magnetic disk media, 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 surface of a removable second magnetic disk medium of the plurality of magnetic disk media,
• 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 surface of the second magnetic disk medium, and
• means for moving the head sliders to access portions of the disk media;
• and
• one or more automated disk handling mechanisms configured to:
• transfer the second magnetic disk medium between the disk storage area and the at least one RWD;
• and
• turn over and removably secure the second magnetic disk medium to the disk spindle;
• wherein the one or more sequences of instructions, when executed by the one or more processors, cause further performance of:
• after the second magnetic disk medium is 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.