Storage go span for cd, dvd, and harddisk...?

Can anybody notify the life span of the above storage.. can it be irreversible or it will inaccessible in years time? i a moment ago want to keep some background forever.

Answer:
No media format will final forever, but as a rule, in the see, in a not dangerous, with no charming fields a HDD will concluding for 10-15 years, a CD of great ability about 5-10 and DVD similar.

Keep it dry, no humidity and overcast, dark is GREAT for keeping things safe and sound.
may it be more then your natural life. and may be shorter then yours regard as. simply it ll. keep it put aside and if you have a supportable drive your compact disc And DVD will retain your data till it gash. but your HDD (harddisk) is unpredictable
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