Ultrathin protective overcoats on magnetic hard disks

Two electrochemical techniques were used to investigate the corrosion of DLC coated magnetic hard disks: (1) potentiodynamic and potentiostatic anodic polarization and (2) electrochemical impedance spectroscopy. The objective was to determine the ability of DC polarization and AC polarization to detect the presence of porosity in the DLC. The results indicate that anodic polarization at high potentials (≈ +1.0V vs SCE) to cause pitting corrosion of the metal layers underneath the DLC might provide a rapid and quantitative estimate of the amount of porosity in the DLC. Measurement of the low frequency electrochemical impedance at intermediate potentials (≈ +0.5V vs SCE) appears to indicate the presence of porosity but further work is required to establish a quantitative relationship between the amount of porosity and the value of the low frequency impedance.

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Kinetics and mechanisms of laser-induced decompositions of hydrogenated amorphous carbon films on magnetic hard disks

Journal of Applied Physics ◽

10.1063/1.1500790 ◽

2002 ◽

Vol 92 (6) ◽

pp. 2962-2968 ◽

Cited By ~ 5

Author(s):

Li Hong Zhang ◽

Hao Gong ◽

Jian Ping Wang

Keyword(s):

Amorphous Carbon ◽

Carbon Films ◽

Hard Disks ◽

Amorphous Carbon Films ◽

Hydrogenated Amorphous Carbon ◽

Magnetic Hard Disks ◽

Hydrogenated Amorphous

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An analog EPR4 Viterbi detector in read channel IC for magnetic hard disks

1998 IEEE International Solid-State Circuits Conference. Digest of Technical Papers, ISSCC. First Edition (Cat. No.98CH36156) ◽

10.1109/isscc.1998.672543 ◽

2002 ◽

Cited By ~ 13

Author(s):

K. Fukahori ◽

D. Hutchinson ◽

R. Kuki ◽

K. Saeki ◽

H. Oshikubo ◽

...

Keyword(s):

Hard Disks ◽

Magnetic Hard Disks ◽

Viterbi Detector

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High current filtered arc deposition for ultra thin carbon overcoats on magnetic hard disks and read-write heads

Surface and Coatings Technology ◽

10.1016/s0257-8972(03)00579-6 ◽

2003 ◽

Vol 174-175 ◽

pp. 648-650 ◽

Cited By ~ 33

Author(s):

B. Petereit ◽

P. Siemroth ◽

H.-H. Schneider ◽

H. Hilgers

Keyword(s):

Hard Disks ◽

High Current ◽

Magnetic Hard Disks ◽

Write Heads ◽

Thin Carbon ◽

Carbon Overcoats ◽

Arc Deposition

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A 200 Mb/s CMOS EPRML channel with integrated servo demodulator for magnetic hard disks

1997 IEEE International Solids-State Circuits Conference. Digest of Technical Papers ◽

10.1109/isscc.1997.585398 ◽

2002 ◽

Cited By ~ 22

Author(s):

J. Fields ◽

P. Aziz ◽

J. Bailey ◽

F. Barber ◽

J. Barner ◽

...

Keyword(s):

Hard Disks ◽

Magnetic Hard Disks

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Staging Methods

Multimedia Information Storage and Retrieval ◽

10.4018/978-1-59904-225-1.ch017 ◽

2011 ◽

pp. 263-271

Author(s):

Phillip K.C. Tse

Keyword(s):

Hard Disks ◽

Input Output ◽

Secondary Storage ◽

Storage Devices ◽

Magnetic Hard Disks ◽

Tertiary Storage ◽

Entire Object

When data are stored in the tertiary storage devices, the tape drives shall read them from the tapes using the input/output (I/O) operations. Due to the long delay in exchanging tapes, it is inconvenient to exchange a tape for each read/write access operation. Thus, the entire object or file is accessed from the tape drives well before they are being used (Federighi & Rowe, 1994; Kienzle, 1995; Pang, 1997). These accessed objects are temporarily stored in the magnetic hard disks as secondary storage level.

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