Logical data recovery vs. physical data recovery
When your hard drive has trouble, there are two types of issues that can happen: logical and physical. Logical data recovery deals with issues such as deleted files; corrupt file systems; or bad sectors. These types of errors may cause problems when booting the computer. Logical data recovery is less expensive because the use of replacement hardware is not used.
Physical data recovery involves invasive repair work on hard drives. Examples of physical repair include: head replacements, PCB (printed circuit board) replacement, and platter swapping. When a hard drive needs physical recovery, the situation can be severe. It is important match parts exactly. Extra cost is involved in physical repair due to the specialized nature of work.