Hard Disk data recovery

Currently, hard disks represent the highest percentage of data storage devices. Their construction based on their storage capacity, work speed, costs, their almost full  compatibility with computer systems make them most vulnerable against data loss. By making a detailed analysis of various incidents of hard disks data loss, we observe different causes, some of them coming from user behavior and others not: accidental files deletion, computer virus attack, wrong handling of information (overwriting, cloning), disks physical failures, etc.

There are two major types of incidents-faults:

LOGICAL DEFECTS

Logical defects represent  inaccessibility of information (in various forms) when a disk is physically  fully functional , while fully respecting the manufacturer s specifications. These defects are treated with various software for analysis and recovery of folders and files structure.

PHYSICAL DEFECTS

Physical defects represent  physical disk failure. These could be firmware defects (internal operating system disk) , electrical or mechanical defects. The way to approach data recovery is  substantially different for each type: firmware is rebuilt/repaired using some programs software and hardware devices. These programs access the disk in a similar way as the construction factory. Electrical damages are corrected by changing faulty components  and reprogramming the others when necessary. Mechanical damages (defect read/write device assembly, blocked engine etc.) suppose their change or their temporary repair to allow data extracts. These operations are made into a class 100 white room (in one cubic meter there are maximum 100 dust particles. We have to specify that usually in one cubic meter air there are up to 3 000,000 dust particles).