Backwards Compatibility
Price Per MegaByte
The question remains how much the MO alternative will set you back. The following table doesn't quite work as, admittedly, we are comparing apples with oranges. In practice, however, these are the most-used alternatives, even when not always the most sensible:
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| Medium | Capacity | Price per GB | Availability | Service life |
|---|---|---|---|---|
| MO medium | 1.3 GB | ~ $ 12 | Specialty store | Up to 50 years |
| CD-RW | 700 MB | ~ $ 1.00 | Just about everywhere | 5 to approx. 15 years * |
| DVD | ||||
| DVD±RW | 4.7 GB | ~ $ 0.90 | Just about everywhere | 5 years and up ** |
| External hard drive | < 250 GB | ~ $ 1.50 | Specialty store | Varies *** |
| * The service life of written CD blanks is difficult to predict. 15 years-20 years in ideal storage is perfectly feasible, even if we have found some media that cause read errors after just a year.** No practical data available in this area yet.*** Unfortunately the danger of hard-drive defects compared to other storage media is distinctively high. We therefore warn against using a hard drive as the sole archiving medium. |
We consciously used the prices for rewritable optical storage media in the table since their comparability with those for MOs should remain as great as possible.
The big plus in the price-capacity stakes should be treated cautiously as CDs and DVDs deteriorate measurably after each new write operation. Of the 1,000 theoretically possible write operations, often not even 200 operations are possible in practice.
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