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Conversely, HDDs store data as a set of blocks, each with a physical (usually magnetic) position on the platter. Block deletion affects adjacent blocks and overwriting does not happen until the entire sector is over written with the new data. This makes it harder, if not impossible, to recover previous data, especially with the failure of a single block. Data recovery software will use various techniques to recover data from an HDD, but is much less common in comparison to the commercial solutions available for flash memory-based storage devices. Techniques such as EPR (Error Propagation Recovery) are used as a last resort, after all other methods have failed to retrieve the entire fragment.
Hard and software-based data recovery from a damaged media or drive can be a lengthy and complicated process that does not always give the result that the user is hoping for. The methods of recovery are generally much more limited than those available to a disk repair technician. Each of the three scenarios discussed below are by no means mutually exclusive, with some solutions being applicable to more than one scenario. However, successful recovery depends on the condition of the media, and the method of data recovery used to recover the data.
File system recovery or file allocation tables is most common and simple when analysing drives, however older drives especially failed sectors, damaged partitions, are still quite regularly repaired using file system recovery or file allocation tables. This is usually done using utilities such as Testdisk
For these techniques to function, partition tables need to be present, as well as partition type information, the likely logical format of each partition, and exact file system information about each file. Partition types are commonly identified with windows you may also touch upon to determine which partition is the boot partition for your operating system. This process is sometimes referred to as a "Unixish" recovery method, however you can use tools such as Testdisk to recover many old drives using it as well. d2c66b5586