US 12,300,280 B1
Methods and apparatus for identifying substrates suitable for magnetic recording media
Shoji Suzuki, San Jose, CA (US); Tao Wang, Shenzhen (CN); and Lulu Xiao, Shenzhen (CN)
Assigned to WESTERN DIGITAL TECHNOLOGIES, INC., San Jose, CA (US)
Filed by Western Digital Technologies, Inc., San Jose, CA (US)
Filed on Jun. 20, 2024, as Appl. No. 18/749,382.
Claims priority of application No. 202410792654.6 (CN), filed on Jun. 19, 2024.
Int. Cl. G11B 5/54 (2006.01); G11B 5/455 (2006.01)
CPC G11B 5/455 (2013.01) 20 Claims
OG exemplary drawing
 
1. A method for identifying a substrate suitable for a magnetic medium of a data storage device configured for magnetic recording, comprising:
determining a roll-off value, a ski-jump value, and a radial-waviness value, each associated with an outer diameter (OD) edge region of a data surface of the substrate;
determining a calculated minimum fly height between a slider of the data storage device and a data surface of the substrate in the OD edge region based on the roll-off value, the ski-jump value, and the radial-waviness value;
comparing the calculated minimum fly height and a fly height threshold; and
determining whether to utilize the substrate for the magnetic medium based on the comparison of the calculated minimum fly height and the fly height threshold.