Retrining types

[Mammals]

Answer to Thomas Schlemmermeyer :

 I vaguely remember having read that the life time
of a CD is about 5 YEARS. Is this right or highly over- underestimated?
Beside this, images in the computer might get lost due to tecnical
problems and viruses.

          These may be problems, but digital images can be copied in
          advance of their deterioration to a backup storage device
          without any loss of information - not true of analog images.

          Sylvia Hope