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What is the ISO29121 data migration standard?
What is the ISO29121 data migration standard?
What is ISO/IEC 29121?
ISO — International Organization for Standardization
IEC — International Electro-technical Commission
Digitally recorded media for information interchange and storage — Data migration method for DVD-R, DVD-RW, DVD-RAM, +R, and +RW disks.
Migration of digital data
Requirements for the storage of data recorded in an optical disc for a long period of time include sampling inspection within every three years or less. This is done to check the deterioration of the optical disc. When deterioration is found to have reached a certain level, digital recording to a new media is necessary.
| Optical Disc | Occurrence of initial error rate (Immediately after Writing) |
Periodic Inspection of Media Error Value. Disks should be checked every three years or less. |
||
|---|---|---|---|---|
| Usable (Rank 1) |
Migration Recommended (Rank 2) |
Immediate migration Necessary (Rank 3) |
||
| DVD-R | Below 140 | Below 200 | 200 or higher, below 280 |
280 or higher |