NDLI: 2.5-mm-Thick 10 GB Hard Disk Drive Using 1-inch Single Side Perpendicular Recording

Content Provider	IEEE Xplore Digital Library
Author	Kaneko, M. Naito, T. Shigematsu, N. Ei-ichi Miyashita Okazaki, Y.
Copyright Year	1965
Abstract	A 2.5-mm-thick head disk assembly (HDA) was made for a capacity of 10 GB using 1-inch single-side perpendicular magnetic recording. Two types of chassis were prepared for investigating capability. All devices were assembled within 2.5 mm thickness on a sufficiently thick base for a block-type HDA, and devices were also assembled on 2.5-mm-thick pressed chassis for a card-type HDA. A 2.4-mm-thick fluid dynamic bearing spindle motor was used for both types of HDAs. The top cover of the chassis was screwed to the fixed central shaft of the spindle motor to ensure the mechanical stability of the card-type HDA. A thin pivot bearing was developed for the HDA. Mechanical simulation revealed that mechanical stability in a 2.5-mm-thick HDA is by no means inferior to that in 5-mm-thick HDA. The areal density of 200 Gb/in² was found in a spin stand using CoCrPt-SiO₂-based a perpendicular medium and a TuMR magnetic head. A new servo track writer was developed for thin HDAs using highly accurate laser scales. A servo signal with a track pitch of 100 nm (250 kTPI) was written on a block-type HDA. Track-pitch positioning accuracy of plusmn7% was achieved at a track pitch of 150 nm (169 kTPI) for both types of HDAs. Write and read performance was investigated in the hard disk assembly combined with printed circuit board
Sponsorship	IEEE Magnetics Society
Starting Page	698
Ending Page	703
Page Count	6
File Size	2762705
File Format	PDF
ISSN	00189464
Volume Number	43
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Hard disks Perpendicular magnetic recording Assembly Magnetic heads Shafts Scanning probe microscopy Stability Servomechanisms Magnetic materials Large scale integration spin stand Fluid dynamic bearing spindle motor hard disk perpendicular magnetic recording pressed chassis
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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