ECMA-421

This Ecma standard specifies a quality discrimination method for optical disks and the operating method of storage systems for long-term digital data preservation using optical disks and optical disk drives (hereinafter referred to as “drives”).

It is applicable to recordable (write-once) optical disks which can prevent physical overwriting and deletion by erroneous or intentional operation in contexts where greater importance is given to evidence. It is also applicable to read-only (ROM) optical disks.

This Ecma standard specifies:

―  Combinations of recordable optical disks and drives used for long-term data preservation;

―  Quality discrimination criteria of recordable optical disks and operation method of long-term storage systems;

―  Quality tests of read-only optical disks and operation method of long-term storage systems;

―  Quality discrimination criteria for BD recordable disks when adopting defect management.