Insights To Flow Induced Vibrations In Computer
Hard Disks
Author(s)
T.H. Yip, M.A. Suriadi, S.C.M. Yu & E.H. Ong
Abstract
Read/write operations in computer hard disk drives (HDD) are supported by a
rotary actuator. Air movements in the drive are a consequence of still air dragged
along by the flat surfaces of the spinning circular disks. Air flowing in the
enclosed HDD induces severe mechanical vibration of the actuator that causes
Track Mis-registration error (TMR) and limits the achievable TPI, an indicator
of the storage capacity of a computer hard disk drive.
The velocity fields of an enclosed HDD model were measured with a Laser
Doppler Anemometer non-intrusively. The model retained most of the common
dimensions and basic features of a 3½ ” HDD. The disks were spun at 10,000
rpm.
From the spatial derivatives of the Reynolds shear stresses spatially
distributed in the HDD model, the aerodynamic force distribut
Keywords
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