Toshiba Announces World's First SD-Read Only Drive for Computers SD Comes of Age with Next-Generation High Density Optical Disc Drive

7 November, 1995

TOKYO -- Toshiba Corporation today announced that it has successfully developed the industry's first prototype super density disc read only memory (SD-ROM) drive, the next-generation high-density optical disc drive for computers. The drive technology offers an extensive range of advanced features, including backward read compatability with CDs and CD-ROMs. Toshiba is confident that it meets all requirements of computer makers and users for a next-generation data storage medium.

The drive is designed to fully conform to the SD format, including its back-to-back bonding of 0.6mm-thick five-inch discs and a single-sided capacity seven times larger than that of a CD-ROM disc. The data transfer rate of the new drive is 1,350 kilobyte per second, equals to that of a CD-ROM drives with a 9-times rotational speed -- a speed yet to be achieved. An additional plus for computer users is that they can enjoy the SD's high-quality moving picture image and high quality sound by installing an MEPG-2 decoder board and a Dolby AC-3 decoder board in their computers.

The development of the SD-ROM drive was achieved by the integration of Toshiba's state-of-the-art technologies for high density optical discs, including a new pick-up head, LSIs for SD systems and a low-noise short-wave semiconductor laser diode. The newly-developed optical pick-up achieves backward compatibility through incorporation of two lenses: one is for SDs, while the other allows users to continue to use their audio CDs and CD-ROM software.

Large capacity SD-ROM discs will encourage advanced software for entertainment and education. It will make full use of moving images and sound with a quality that far exceeds that of current CD-ROMs. The SD-ROM can also be utilized for home shopping via electronic catalogues, and other businesses that are emerging with the increasing development of mulitmedia applications.

The drive will be shown at COMDEX/Fall, due to start on November 13 in Las Vegas, U.S.A.

Main specifications of the SD-ROM drive

Model Built-in 5.25-inch, half-height size
Applicable Disc Format SD book, Red book, Yellow book
CD-ROM XA, CD-I, CD-I Ready, CD-Plus
Interface ATAPI or SCSI-2
Sustained mode 1,350KB/s
Burst mode ATAPI 11.1MB/s
SCSI 5.0MB/s (Sync.)
4.0MB/s (Async.)
Wavelength of Semiconductor
Laser diode
Red laser diode 650nm
Power supply DC 5V/12V
Dimensions 41.5(H) x 146.0(W) x 203.0(D)mm

Note: Dolby is a trademark of Dolby Laboratories Licensing Corp.

Information in the press releases, including product prices and specifications, content of services and contact information, is current on the date of the press announcement,but is subject to change without prior notice.