An experimental study on the flow behavior near the read-and-write arm in a hard disk drive model with a shroud opening

2013 ◽  
Vol 19 (9-10) ◽  
pp. 1519-1527
Author(s):  
Katsuaki Shirai ◽  
Lars Büttner ◽  
Shinnosuke Obi ◽  
Jürgen Czarske
Keyword(s):  
Experimental Study ◽  
Hard Disk Drive ◽  
Flow Behavior ◽  
Hard Disk ◽  
Disk Drive ◽  
Drive Model

Experimental Investigation of the Complex Flow Behavior in a Hard Disk Drive Model

2011 ◽  
Author(s):  
Katsuaki Shirai ◽  
Lars Bu¨ttner ◽  
Ju¨rgen Czarske ◽  
Nobuo Shiga ◽  
Shinnosuke Obi
Keyword(s):  
Hard Disk Drive ◽  
Flow Behavior ◽  
Hard Disk ◽  
Axial Direction ◽  
Disk Drive ◽  
Complex Flow ◽  
Velocity Statistics ◽  
Desktop Computers ◽  
Lower Disk ◽  
Drive Model

Flow inside a hard-disk drive (HDD) is investigated using a simplified 3.5″ HDD model with shroud opening and read-and-write arm (RWA). The model is designed to serve as a benchmark of HDD flow study both in experiments and in numerical simulations. The complex flow behavior in the narrow disk-to-disk space is focused with the RWA inserted into the space. The velocity statistics are acquired at totally 8 different locations using a velocity profile sensor with a spatial slot resolution of 30 μm along the axial direction. The measurement was carried out at the disk Reynolds number Red = 2.4×105 which corresponds to the rotation speed of 7700 rpm at a real 3.5″ HDD for desktop computers. The resulting mean velocities and Reynolds stress components are influenced by the shroud opening and especially by the RWA, compared to an axisymmetric model without an RWA. The highly sheared flow between the RWA and adjacent upper/lower disk was successfully captured in the experiment.

Experimental study of the flow-structure interactions in an air- or helium-filled hard disk drive geometry

2011 ◽  
Vol 18 (1) ◽  
pp. 43-56 ◽  
Author(s):  
S. W. Kil ◽  
J. A. C. Humphrey ◽  
H. Haj-Hariri
Keyword(s):  
Experimental Study ◽  
Hard Disk Drive ◽  
Flow Structure ◽  
Hard Disk ◽  
Disk Drive

Highly spatially resolving laser Doppler velocity measurements of the tip clearance flow inside a hard disk drive model

2010 ◽  
Vol 50 (3) ◽  
pp. 573-586 ◽  
Author(s):  
Katsuaki Shirai ◽  
Yusuke Yaguchi ◽  
Lars Büttner ◽  
Jürgen Czarske ◽  
Shinnosuke Obi
Keyword(s):  
Hard Disk Drive ◽  
Hard Disk ◽  
Disk Drive ◽  
Tip Clearance ◽  
Laser Doppler ◽  
Doppler Velocity ◽  
Velocity Measurements ◽  
Tip Clearance Flow ◽  
Clearance Flow ◽  
Drive Model

Experimental Study of Dual Heater Slider Touchdown Detectability

2013 ◽  
Vol 284-287 ◽  
pp. 468-472
Author(s):  
Da Peng Zhao ◽  
Xiong Fei Wei ◽  
Yu Wang ◽  
Bin Liu ◽  
Sheng Xiang Chen ◽  
...  
Keyword(s):  
Experimental Study ◽  
Hard Disk Drive ◽  
Hybrid Method ◽  
Feasible Solution ◽  
Hard Disk ◽  
Areal Density ◽  
Disk Drive ◽  
Detection Methods ◽  
Magnetic Head ◽  
Single Method

With the increase of areal density in hard disk drive (HDD), the mechanical spacing between magnetic head and disk has decreased to sub~1nm. Under such ultra-low spacing, accurate spacing control becomes more important for lowering down the risk of head-disk interference and getting good bit per inch (BPI) performance. Dual-heater slider technology has been considered as a most useful solution. This paper introduces the advantages of dual heater in reading/writing spacing control. Furthermore, as a key issue in precise spacing control, the touchdown detectability of dual-heater slider was also investigated using three TD detection methods under writing and reading mode. Result shows that a single method is difficult to get the best TD detectability under both writing and reading mode. Instead, hybrid method may be a feasible solution.

An Experimental Study on Vibration of Disks Mounted on Hard Disk Drive Spindles

2003 ◽  
Vol 46 (3) ◽  
pp. 465-468 ◽  
Author(s):  
Q. D. Zhang ◽  
S. H. Winoto ◽  
G. X. Guo ◽  
J. P. Yang
Keyword(s):  
Experimental Study ◽  
Hard Disk Drive ◽  
Hard Disk ◽  
Disk Drive

G051021 Visualization of the Complex Flow Behavior inside Non-Axisymmetric Enclosure Model of a Hard Disk Drive

2013 ◽  
Vol 2013 (0) ◽  
pp. _G051021-1-_G051021-5
Author(s):  
Ryo TADA ◽  
Katsuaki SHIRAI ◽  
Tsuyoshi KAWANAMI ◽  
Shigeki HIRASAWA
Keyword(s):  
Hard Disk Drive ◽  
Flow Behavior ◽  
Hard Disk ◽  
Disk Drive ◽  
Complex Flow

scholarly journals An experimental study of the dimple/gimbal interface in a hard disk drive

2011 ◽  
Vol 17 (5-7) ◽  
pp. 863-868 ◽  
Author(s):  
Longqiu Li ◽  
Edmund Fanslau ◽  
Frank Talke
Keyword(s):  
Experimental Study ◽  
Hard Disk Drive ◽  
Hard Disk ◽  
Disk Drive
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