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

In Situ Spacing Fluctuation Monitoring of Hard Disk Drive with Thermal Asperity Sensors

2013 ◽  
Vol 284-287 ◽  
pp. 790-794
Author(s):  
Da Peng Zhao ◽  
Xiong Fei Wei ◽  
Bin Liu ◽  
Yu Wang ◽  
Sheng Xiang Chen ◽  
...  
Keyword(s):  
Hard Disk Drive ◽  
Laser Doppler Vibrometer ◽  
Hard Disk ◽  
Disk Drive ◽  
Laser Doppler ◽  
Factors Affecting ◽  
Series Of Experiments

This paper presents an investigation of spacing fluctuation characterization (SFC) of Hard Disk Drive (HDD) using thermal asperity (TA) sensor. Firstly, the spacing fluctuation monitored by TA sensor is correlated with that monitored by a Laser Doppler Vibrometer (LDV). Secondly, a series of experiments are conducted to study the factors affecting the spacing fluctuation, including disk distortion, head crown sensitivity, ZH sensitivity. Good disk assembly and small crown sensitivity and ZH sensitivity will be helpful to reduce spacing fluctuation.

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.

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

Hard disk drive failure prediction using SMART attribute

2021 ◽  
Author(s):  
Vikas Tomer ◽  
Vedna Sharma ◽  
Sonali Gupta ◽  
Devesh Pratap Singh
Keyword(s):  
Hard Disk Drive ◽  
Failure Prediction ◽  
Hard Disk ◽  
Disk Drive
Sign in / Sign up

Export Citation Format

Share Document