Chapter 1 Introduction; Overview; Features - Sony SMO-S551 Mode D'emploi

Chapter 1 Introduction

Overview

Features

The SMO-S551 Magneto-Optical Disk
Subsystem has the following features:
• Magneto-optical technology enables repeated
writing and erasing of data on the disk.
• The subsystem automatically senses the type of
disk being inserted, enabling the free use of
both 650-Mbytes (594-Mbytes), 1.3-Gbytes
(1.2-Gbytes), 2.6 Gbytes (2.3 Gbytes), and 5.2
Gbytes (4.8 Gbytes, 4.1 Gbytes) disks
indifferently.
• A maximum of 5.2 Gbytes (2,048 bytes/sector),
4.8 Gbytes (1,024 bytes/sector) or 4.1 Gbytes
(512 bytes/sector) of data can be written on the
two sides of a 5.25-inch magneto-optical disk.
This is equivalent to about 2900–3700 times the
capacity of a conventional 3.5-inch floppy disk
(2HD).
• Any disk conforming to the internationally
accepted CCS (continuous/composite servo) or
CCW (continuous composite write-once) format
can be used in this subsystem.
• This subsystem employs SCSI-2 (Small
Computer System Interface-2).
• The 3,300 min -1 (3,300 rpm) high-speed spindle
motor enables data transfer rates of 2.48 – 5.07
Mbytes/s (2,048 bytes/sector), 2.31 – 4.79
Mbytes/s (1,024 bytes/sector) or 1.97 – 4.06
Mbytes/s (512 bytes/sector).
• With disk capacities under 2.6 Gbytes (2.3
Gbytes), the spindle motor rotates at 3600 min
(rpm).
• The low-profile, light-weight optical pick-up
yields average seek times of 25 ms.
• Use of a highly reliable error correction code
(ECC) system keeps the error rate as low as
-12
10 .
• Optimum operation environment is provided
through use of a large, 4 MB buffer and
optimized cache control algorithm. (Write cache
can be enabled or disabled. For details, see
"Setting the Subsystem's Functions" on page
24.)
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Chapter 1 Introduction