Data recovery is a generic term used to describe the retrieval of information stored on damaged digital mediums. In most cases, the term data recovery replies to data stored on mechanical hard drives, but it is also possible to recover data from CDs, DVDs, Blu-ray discs, memory cards, and even USB thumb drives. It is also important to note that there are two different styles of data recovery techniques: physical and software.
Physical data recovery techniques require replacing and/or repairing damaged components of a storage system. For example, if the motor on a hard drive were to wear out, it is still possible to recover data from the individual platters by carefully transplanting them into a new hard drive or by replacing the motor. If the head of the hard drive were to have scratched one or more of the platters, it may be possible to try to physically repair the damaged portions of the individual platter(s). The same is generally true of data recovery techniques for other mediums as well. If the medium is damaged, it may be repairable. If the supporting hardware is damaged, it may be possible to replace or transplant hardware and access the data. It is worth noting that hardware based data recovery techniques may also be called data rescue , hard drive rescues, hard drive recoveries, or similar terms.
Software can also be used in a data recovery process. In most cases, files that are deleted or recycled are not actually removed from the storage medium. Instead, the data is no longer protected from being overwritten by new files. It is possible to recover this data in its entirety in almost all cases just so long as no other files have been written to the same physical areas. Some of the more advanced data recovery software can even help restore data from recently formatted hard drives unless the hard drive or other storage medium was zeroed out.
Zeroing out a storage medium is often referred to as secure erasing, and is difficult to circumvent. There are some very high-level and expensive data recovery techniques that can help recover data from zeroed out drives, but the techniques are not necessarily the most reliable or cost effective. In fact, only larger corporations and government entities tend to invest resources in this form of data recovery, though there are a few exceptions to this rule.
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