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2Human error (file deletion, formatting a hard drive etc., The the most common way files are lost):
4Software files corruption (database file gets corrupt because of a software glitch):
6Media physical problem with bad electronics (circuitry of the media goes bad):
7Media Physical problem with internal damage (bad head stack) [Magnetic Hard Drives only];
8Media Physical problem with bad motor (drive doesnt spin, etc:) [Magnetic hard drives only];
10Dropped storage meeting in a laptop got dropped or an external drive:
11No Title
13Bad quality or aging CD/DVD storage media (over time the film on a CD/DVD will degrade):
14Known manufacturing defects causing loss of access to data:
poor to fair probability of recovery.