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.

Optimum Design of Magnetic Head Slider Under Static and Dynamic Operation Conditions of Hard Disk Drive

1999 ◽  
Author(s):  
Yasuhisa Hattori ◽  
Hiromu Hashimoto ◽  
Masayuki Ochiai
Keyword(s):  
Objective Function ◽  
Hard Disk Drive ◽  
Optimum Design ◽  
Hard Disk ◽  
Disk Drive ◽  
Magnetic Head ◽  
Head Slider ◽  
Dynamic Operation ◽  
Operation Conditions ◽  
Design Variables

Abstract The aim of this paper is to develop the general methodology for the optimum design of magnetic head slider for improving the spacing characteristics between head slider and disk surfaces under the static and dynamic operation conditions of hard disk drive and to present an application of the methodology to IBM 3380-type slider design. In the optimum design, the objective function is defined as the weighted sum of minimum spacing, maximum difference of spacing due to variation of radial location of head and maximum amplitude ratio of slider motion. Slider rail width, taper length, taper angle, suspension position and preload are selected as the design variables. Before the optimization of magnetic head slider, the effects of these five design variables on the objective function are examined by the parametric study, and then the optimum design variables are determined by applying the hybrid optimization technique combining the direct search method and the successive quadratic programming (SQP). From the results obtained, the effectiveness of optimum design on the spacing characteristics of magnetic head slider is clarified.

Study Swaging Process for Reduction Swage Effect in Hard Disk Drive

2013 ◽  
Vol 677 ◽  
pp. 256-262 ◽  
Author(s):  
Joompondej Bamrungwongtaree ◽  
Mongkol Mongkolwongrojn
Keyword(s):  
Hard Disk Drive ◽  
Base Plate ◽  
Hard Disk ◽  
Areal Density ◽  
Disk Drive ◽  
Compression Force ◽  
Fe Method ◽  
Inner Surface ◽  
Inner Diameter

In hard disk drive manufacturing common uses ball swaging. It is a process that used to assemble a boss tower and an arm aperture. The swage ball has a larger diameter than an inner diameter of the boss tower. Application a compression force to the inner surface of the boss tower to hold both components together with adequate holding force and without damaging the boss tower components result in HGA torque retention. Measurements of HSA KPIV after swaging obtained from deformation of base plate and arm pad together. Due to hard disk drive is dynamically developed by increasing in the areal density and reducing in size, thus the arm pad is thinned. This study focuses on reducing of the swage effect by control outer arm pad deformation to maintain HSA performance. HGA torque retention was considered to reduce gap to arm and to avoid HSA resonance while swaging quality was similar. The 3-D FE method was used for analysis. The analysis and experiment show that HGA torque retention and the arm aperture modified was almost linear. Furthermore, the reduction of arm deformation and gap to arm cause increasing in HSA performance. The arm aperture can be modified for manufacturability.

Flow induced vibration of magnetic head suspension in hard disk drive

1986 ◽  
Vol 22 (5) ◽  
pp. 1022-1024 ◽  
Author(s):  
Y. Yamaguchi ◽  
K. Takahashi ◽  
H. Fujita ◽  
K. Kuwahara
Keyword(s):  
Hard Disk Drive ◽  
Hard Disk ◽  
Disk Drive ◽  
Magnetic Head ◽  
Flow Induced Vibration

Effect of Non-Operational Shock on Interaction Between Suspension Lift-Tab and Load/Unload Ramp

2005 ◽  
Author(s):  
Aravind N. Murthy ◽  
Eric M. Jayson ◽  
Frank E. Talke
Keyword(s):  
Hard Disk Drive ◽  
Failure Modes ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Areal Density ◽  
Disk Drive ◽  
Disk Drives ◽  
Head Disk Interface ◽  
Disk Interface ◽  
Operational Shock

Most hard disk drives manufactured in the last few years have Load/Unload (L/UL) technology. As opposed to the Contact Start/Stop (CSS) technology, L/UL technology has the advantage of improved areal density because of more disk space availability and better shock performance. The latter characteristic has significant benefits during the non-operational state of the hard disk drive since head/disk interactions are eliminated and the head is parked on a ramp adjacent to the disk. However, even if head/disk interactions are absent, other failure modes may occur such as lift-tab damage and dimple separation leading to flexure damage. A number of investigations have been made to study the response of the head disk interface with respect to shock when the head is parked on the disk ([1], [2]). In this paper, we address the effect of non-operational shock for L/UL disk drives.

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

The Simulation of Solder Bridging on TuMR Magnetic Head Connector

2012 ◽  
Vol 157-158 ◽  
pp. 144-148
Author(s):  
Reangroaj Roajanasiri ◽  
Nitin Afzulpurkar ◽  
Siridech Boonsang
Keyword(s):  
Product Design ◽  
Hard Disk Drive ◽  
Cost Reduction ◽  
Hard Disk ◽  
Disk Drive ◽  
Product Performance ◽  
Magnetic Head ◽  
High Productivity ◽  
Market Needs ◽  
Rework Process

The Hard Disk Drive is the important components in the present computer. The Hard Disk Drive manufacturing need high productivity and cost improvement to support the market needs. Many cost reduction are done on product design, material cost and manufacturing operation. This work shows an idea to improve productivity and also reduce the scrap cost by rework process. The product performance will be considered to prevent the reduction of reliability and degradation.

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