scope:

Introduction

This standard specifies test methods for media characteristics of 356-mm nominal diameter optical disk cartridges used for information processing systems and for information storage. A summary regarding the intended use of the optical disk cartridge in the related media standard is as follows:

- Write once, read many times;

- Pulse width modulation;

- 10 Mbit/s data rate;

- Delay Modulation Mark (i.e., MFM (1,3)) encoding;

- Mark edge detection;

- Banded CAV (r/min constant within a band);

- Sampled-data tracking system.

Such a 356-mm optical disk cartridge comprises three parts: an optical disk, a carrier, and a caddy. The carrier is for capture and equipment handling of the optical disk. The optical disk and carrier are contained by the caddy, which provides protection from contaminants during operation and human handling. In addition, the test methods described in this standard apply to 356-mm optical disks having a protective layer thickness of either 90 µm or 1.2 mm.

Purpose

This standard provides test methods and test procedures for media characteristics. Unless otherwise noted, these procedures are required to verify conformance with the proposed related media standard, ANSI X3.200.¹⁾

The original dimensions and quantities for all numeric values in this standard are units of the International System of Units (SI).

Conformance

Interchange parties complying with ANSI X3.200¹⁾ and this standard should be able to achieve compatibility without the need for additional exchange of technical information.

¹⁾ This standard is currently under development. Contact the secretariat for more recent information.