A Study on Key Technologies to Realize Magneto-Optical Storage of Over 7 GBytes in CD Sized Disk

Kenji TORAZAWA; Satoshi SUMI; Seiji YONEZAWA; Naomi SUZUKI; Yasuhito TANAKA; Akira TAKAHASHI; Yoshiteru MURAKAMI; Norio OHTA

A Study on Key Technologies to Realize Magneto-Optical Storage of Over 7 GBytes in CD Sized Disk

Kenji TORAZAWA, Satoshi SUMI, Seiji YONEZAWA, Naomi SUZUKI, Yasuhito TANAKA, Akira TAKAHASHI, Yoshiteru MURAKAMI, Norio OHTA

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Recently, many types of high-density recording technologies for future MO (Magneto-Optical) storage have been reported. MSR (Magnetically Induced Super Resolution) technology is one of the most promising candidates, and over ten types of MSR technologies have been already proposed. However, they are not well-discussed from the viewpoint of total recording technology which would include the recording and readout methods, the pick-up technology and the signal processing technology. Key technologies for realizing MO storage of over 7 GBytes in a CD-sized disk using a red laser are proposed, and the experimental results pertaining to each key technology are described. The write/read characteristics were examined for the CAD (Center Aperture Detection)-MSR disk. From the characteristics of the CAD-MSR disk combined with laser pumped magnetic field modulation recording, it was shown that land/groove (0.7 µm width) recording with the linear density of 0.27 µm/bit and track pitch below 0.7 µm can be realized. It was also shown that CAD-MSR disk is well combined with an OSR (Optical Super Resolution) pick up, laser pumped read-out and PRML (Partial Response Maximum Likelihood) technologies which are very useful to achieve a high density MO disk. Using CAD-MSR disk combined with above technologies together, high density write/read with a bit length of 0.2 µm and a track pitch of 0.6 µm should be realized with using the laser of 635 nm wavelength. Applying the CAD-MSR disks to a CD sized MO disk, the capacity becomes over 7 GBytes (Format efficiency: 80%), which is 20 times higher than 5.25 inches MO disk and 1.5 times than DVD-ROM.

Publication: IEICE TRANSACTIONS on Electronics Vol.E80-C No.9 pp.1142-1148

Publication Date: 1997/09/25

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Type of Manuscript: Special Section INVITED PAPER (Special Issue on High Density Information Recording Technologies)

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Kenji TORAZAWA, Satoshi SUMI, Seiji YONEZAWA, Naomi SUZUKI, Yasuhito TANAKA, Akira TAKAHASHI, Yoshiteru MURAKAMI, Norio OHTA, "A Study on Key Technologies to Realize Magneto-Optical Storage of Over 7 GBytes in CD Sized Disk" in IEICE TRANSACTIONS on Electronics, vol. E80-C, no. 9, pp. 1142-1148, September 1997, doi: .
Abstract: Recently, many types of high-density recording technologies for future MO (Magneto-Optical) storage have been reported. MSR (Magnetically Induced Super Resolution) technology is one of the most promising candidates, and over ten types of MSR technologies have been already proposed. However, they are not well-discussed from the viewpoint of total recording technology which would include the recording and readout methods, the pick-up technology and the signal processing technology. Key technologies for realizing MO storage of over 7 GBytes in a CD-sized disk using a red laser are proposed, and the experimental results pertaining to each key technology are described. The write/read characteristics were examined for the CAD (Center Aperture Detection)-MSR disk. From the characteristics of the CAD-MSR disk combined with laser pumped magnetic field modulation recording, it was shown that land/groove (0.7 µm width) recording with the linear density of 0.27 µm/bit and track pitch below 0.7 µm can be realized. It was also shown that CAD-MSR disk is well combined with an OSR (Optical Super Resolution) pick up, laser pumped read-out and PRML (Partial Response Maximum Likelihood) technologies which are very useful to achieve a high density MO disk. Using CAD-MSR disk combined with above technologies together, high density write/read with a bit length of 0.2 µm and a track pitch of 0.6 µm should be realized with using the laser of 635 nm wavelength. Applying the CAD-MSR disks to a CD sized MO disk, the capacity becomes over 7 GBytes (Format efficiency: 80%), which is 20 times higher than 5.25 inches MO disk and 1.5 times than DVD-ROM.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e80-c_9_1142/_p

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@ARTICLE{e80-c_9_1142,
author={Kenji TORAZAWA, Satoshi SUMI, Seiji YONEZAWA, Naomi SUZUKI, Yasuhito TANAKA, Akira TAKAHASHI, Yoshiteru MURAKAMI, Norio OHTA, },
journal={IEICE TRANSACTIONS on Electronics},
title={A Study on Key Technologies to Realize Magneto-Optical Storage of Over 7 GBytes in CD Sized Disk},
year={1997},
volume={E80-C},
number={9},
pages={1142-1148},
abstract={Recently, many types of high-density recording technologies for future MO (Magneto-Optical) storage have been reported. MSR (Magnetically Induced Super Resolution) technology is one of the most promising candidates, and over ten types of MSR technologies have been already proposed. However, they are not well-discussed from the viewpoint of total recording technology which would include the recording and readout methods, the pick-up technology and the signal processing technology. Key technologies for realizing MO storage of over 7 GBytes in a CD-sized disk using a red laser are proposed, and the experimental results pertaining to each key technology are described. The write/read characteristics were examined for the CAD (Center Aperture Detection)-MSR disk. From the characteristics of the CAD-MSR disk combined with laser pumped magnetic field modulation recording, it was shown that land/groove (0.7 µm width) recording with the linear density of 0.27 µm/bit and track pitch below 0.7 µm can be realized. It was also shown that CAD-MSR disk is well combined with an OSR (Optical Super Resolution) pick up, laser pumped read-out and PRML (Partial Response Maximum Likelihood) technologies which are very useful to achieve a high density MO disk. Using CAD-MSR disk combined with above technologies together, high density write/read with a bit length of 0.2 µm and a track pitch of 0.6 µm should be realized with using the laser of 635 nm wavelength. Applying the CAD-MSR disks to a CD sized MO disk, the capacity becomes over 7 GBytes (Format efficiency: 80%), which is 20 times higher than 5.25 inches MO disk and 1.5 times than DVD-ROM.},
keywords={},
doi={},
ISSN={},
month={September},}

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TY - JOUR
TI - A Study on Key Technologies to Realize Magneto-Optical Storage of Over 7 GBytes in CD Sized Disk
T2 - IEICE TRANSACTIONS on Electronics
SP - 1142
EP - 1148
AU - Kenji TORAZAWA
AU - Satoshi SUMI
AU - Seiji YONEZAWA
AU - Naomi SUZUKI
AU - Yasuhito TANAKA
AU - Akira TAKAHASHI
AU - Yoshiteru MURAKAMI
AU - Norio OHTA
PY - 1997
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E80-C
IS - 9
JA - IEICE TRANSACTIONS on Electronics
Y1 - September 1997
AB - Recently, many types of high-density recording technologies for future MO (Magneto-Optical) storage have been reported. MSR (Magnetically Induced Super Resolution) technology is one of the most promising candidates, and over ten types of MSR technologies have been already proposed. However, they are not well-discussed from the viewpoint of total recording technology which would include the recording and readout methods, the pick-up technology and the signal processing technology. Key technologies for realizing MO storage of over 7 GBytes in a CD-sized disk using a red laser are proposed, and the experimental results pertaining to each key technology are described. The write/read characteristics were examined for the CAD (Center Aperture Detection)-MSR disk. From the characteristics of the CAD-MSR disk combined with laser pumped magnetic field modulation recording, it was shown that land/groove (0.7 µm width) recording with the linear density of 0.27 µm/bit and track pitch below 0.7 µm can be realized. It was also shown that CAD-MSR disk is well combined with an OSR (Optical Super Resolution) pick up, laser pumped read-out and PRML (Partial Response Maximum Likelihood) technologies which are very useful to achieve a high density MO disk. Using CAD-MSR disk combined with above technologies together, high density write/read with a bit length of 0.2 µm and a track pitch of 0.6 µm should be realized with using the laser of 635 nm wavelength. Applying the CAD-MSR disks to a CD sized MO disk, the capacity becomes over 7 GBytes (Format efficiency: 80%), which is 20 times higher than 5.25 inches MO disk and 1.5 times than DVD-ROM.
ER -