Logical Data Recovery
Logical Data Recovery is typically the most difficult, and consequently, the most expensive. Recovering files logically includes recovering the data portion of a tape that was successfully recorded, but for some unknown reason cannot be read. The recovery of files from this type of problem often requires multiple passes using proprietary software that restores the file to the HDD. If hard errors occur, "dummy blocks" are written in their place, the file fragments are pieced back together and the logically re-created file written to the appropriate output tape.
Other forms of Logical Data Recovery include tapes that were written with misaligned heads, and tapes that contain critical data and were re-initialised by mistake. All of these problems can be recovered, or at least partially recovered using internally developed proprietary software and processes.
1) The process of translating data from one format to another. Data migration is necessary when an organisation decides to use a new computing systems or database management system that is incompatible with the current system. Typically, data migration is performed by a set of customised programs or scripts that automatically transfer the data.
(2) The process of moving data from one storage device to another. In this context, data migration is the same as Hierarchical Storage Management (HSM).
Physical Data Recovery