Introduction Chapter

Overview

Features

The Sony BW-RS101/BW-RU101 “Professional Disc for DATA” Unit comes with the following features.

•The “Professional Disc for DATA” external optical disc unit uses a short- wave blue violet laser with a wavelength of 405 nm.

•The powerful objective lens used for focusing the laser beam has a numerical aperture of 0.85, resulting in a track pitch of only 0.32 µm. This makes writing as much as 23.3 GB of data on one side of a disc possible.

•A 0.1 mm cover layer enables a high tilt tolerance.

•The overall thickness of the 120 mm discs is 1.2 mm and the recording layer has a cover layer of only 0.1 mm thick. This effectively increases the margin of error when the disc tilts or bends. Tilt tolerance is thus enough to enhance reliability for read/write operations.

•The BW-RS101 uses SCSI-3 (Ultra 160 LVD/SE SCSI).

•The BW-RU101 uses Hi-Speed USB (USB 2.0).

•The seek time in the CAV is 110 ms (1/3 stroke) or 200 ms (full stroke).

•In CLV mode, the high-speed spindle motor allows for a 9 MB/s write data transfer speed and a 10.8 MB/s read data transfer speed.

•In CAV, the high-speed spindle motor allows for 4.5 to 9 MB/s write data transfer speed and 4.5 to 10.8 MB/s read transfer speed.

Compatible Discs

The BW-RS101 and BW-RU101 are compatible with two types of discs.

Disc name

Type

Capacity

Disc diameter

 

 

 

 

PDDRW23

Rewritable

23.3 GB

120 mm

 

 

 

 

PDDWO23

Write-once

23.3 GB

120 mm

 

 

 

 

Overview 5