a co takhle ... jedna se o garanci za splneni techto podminek .... coz neni zas tak uplne jednoduche, ale kdo stoji o svoje data, tak co by pro ne neudelal. vic info zde http://www.osta.org/technology/cosa.htm a pak hlavne toto .PDF http://www.osta.org/technology/pdf/whitepapers/OSFA-12-05-04.pdf
toto mam od naseho vyrobce serverovych archivacnych zarizeni na DVD, chysta se i BD - viz http://www.primera.com/backup-archival.html
On the basis of laboratory accelerated age testing, Primera estimates that the storage life of Primera TuffCoat™ DVD+R, 8x/1x media will exceed 50 years provided that:
1. The disc is properly recorded without errors
2. The recorded disc is verified by high quality test equipment
3. The disc is stored vertically in an industry standard jewel case
4. The temperature in storage does not exceed 90° F
5. The temperature in storage does not fall below 0° F
6. The temperature in storage does not change more than 10° per hour
7. The relative humidity in storage does not exceed 60%
8. The relative humidity in storage does not fall below 10%
9. The relative humidity in storage does not change more than 10% per hour
10.   ; The storage area is free of vibration and shock
11.   ; The disc is not exposed to direct sunlight
12.   ; The disc does not come into contact with organic solvents
13.   ; The disc is not physically damaged during storage or use
The long term ability to play a stored disc also depends on the availability of a drive and software that remain compatible with the disc and format.