Chapter 1 Introduction; Overview; Features - Sony RMO-S551 User Manual

Chapter 1 Introduction

Overview

Features

The RMO-S551 Magneto-Optical Disk Unit has
the following features:
• Magneto-optical technology enables repeated
writing and erasing of data on the disk.
• The disk unit 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 disk unit.
• This disk unit employs SCSI-2 (Small
Computer System Interface-2).
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• The 3,300 min (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 25ms.
• Use of a highly reliable error correction code
(ECC) system keeps the error rate as low as
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10 .
• Optimum operation environment is provided
through use of a large, 4MB buffer and
optimized cache control algorithm. (Write cache
can be enabled or disabled. For details, see
"Setting the Disk Unit's Functions" on page
10.)
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Chapter 1 Introduction