Patent ID: 11935559
Assignee: FURUKAWA ELECTRIC CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 4:
5. A hard disk drive, the hard disk drive being a 3.5-inch hard disk drive on which a magnetic disk formed of a glass substrate is mounted, wherein
a thickness Td of each of magnetic disks that are arranged in a stacked manner is 0.3 mm or more and 0.6 mm or less, a number N of the magnetic disks is 10 or more and 16 or less, and an outer diameter 2Rso of a spacer that is arranged between the magnetic disks is 35 mm or more and 65 mm or less, and
the thickness Td of the magnetic disk is 0.3 mm or more and 0.49 mm or less, and the outer diameter 2Rso (mm) of the spacer satisfies 2Rso≥−74Td+69.3 and 2Rso≤−0.42N2+14.8N−63.1.