Many types of defects, physical damage to the media. CD-ROM can have their metallic substrate or layer of paint from damaged hard drives can, for various mechanical problems such as head crashes and motor suffer, teams can simply cut off. Physical damage always causes at least the loss of data, in many cases, the logical structure of the system files corrupted. Damage must before logical files can be recovered in the media treated.
Most physical damage can be corrected by the end user. For example, can order a gap in the normal environment drive the dust settle and stay in the air between the disk and disk and head, leading to crashes lisävahingoittumisesta top plate, and thus threaten the recovery. In addition, users are generally not the equipment or technical expertise required to perform these repairs. Therefore, data recovery companies are very expensive, often store important information .
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