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The use of scattering parameters (S-parameters) to characterize high frequency interconnects has widely been used in the signal integrity field and is now being accepted into the disk drive arena as the preferred modeling tool for write and read path interconnects. The motivating factor for the shift from traditional lumped circuit models to S-parameter models has been the increase in data rates which exceed 1 GB/s. S-parameter models are convenient because they can be used directly in several high end spice circuit simulators as "black box" models. This paper will describe recent measurement techniques which make vector (VNA) network analyzer measurements possible for various interconnect structures up to 8.5 GHz. This paper will verify the results using time domain refiectometry (TDR) measurements of the same interconnect structures. Specific examples on signal losses, impedance, and coupling will be shown. Advances in achieving a broad range of differential impedances while maintaining high bandwidth will be demonstrated with idealized test structures. [ABSTRACT FROM AUTHOR]

In this paper, we propose a novel shockproof head gimbals assembly (HGA) structure incorporated with "a balanced-type head suspension" for 0.85-in hard disk drives (HDD5), and investigated its performance on external shock resistance during read/write operations. Experimental drop impact test results confirm that the 0.85-in drive equipped with the new suspension structure is durable over 2000 G (1.0 ms duration) of external shock, ensuring no head slider and/or disk surface damage. According to computer simulation and experimental results, potential shock resistance of more than 2000 G may also be possible with the head actuator itself, which points to its application in cellular phones. [ABSTRACT FROM AUTHOR]