US 11,735,220 B2
Phase locking multiple clocks of different frequencies
Zheng Wu, Los Altos, CA (US); and Jason Bellorado, San Jose, CA (US)
Assigned to Seagate Technology LLC, Fremont, CA (US)
Filed by Seagate Technology LLC, Fremont, CA (US)
Filed on Dec. 27, 2021, as Appl. No. 17/562,426.
Prior Publication US 2023/0206951 A1, Jun. 29, 2023
Int. Cl. G11B 20/10 (2006.01); G11B 5/596 (2006.01); G11B 11/105 (2006.01)
CPC G11B 11/10578 (2013.01) [G11B 5/59655 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a data channel including a phase lock clock (PLC) module configured to:
synchronize multiple servo clocks to a reference clock, the multiple servo clocks used to read servo data from servo zones with different frequencies, and the reference clock used to perform a write of a spiral pattern utilizing a single frequency phase; and
after synchronization of the multiple servo clocks, perform the write to a first data storage medium while a write head is positioned based on the servo zones with different frequencies.