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How does Disk Recovery Work?
Whenever a breakdown occurs, recovery becomes the priority so that the files on the damaged systems can be retrieved to be used again.
What is Disk Recovery?
Disk recovery is the process that enables the retrieval of files from the computer hard drives, magnetic disks, optical devices or tape cartridges.
What are the Reasons for Data Loss?
There are many reasons due to which data gets lost and has to be recovered.
They could include any of the following:
- The metallic substrate on a CD-ROM gets scratched off.
- A hard disk suffers a mechanical failure such as a head crash.
- Errors within the software used.
- Damage caused by power outages.
Most of the damages are difficult for an end user to rectify, due to the technicalities involved in the process. If the end user even attempts to rectify, the possibility is that it can damage the system beyond repair, so, consulting an expert is always recommended.
Techniques for Recovery
First, the thing that has to be done before rectification of the problem is to determine the extent of damage.
The recovery process involves procedures such as:
- Repairing the hardware
- Imaging of the disk
Repair of the hardware may involve certain replacements such as:
- Replacement of the printed circuit board (PCB) on the drive
- Removing hard disk platters from the crashed disk and putting them into a new disk.
How does Data Recovery Work?
Windows never completely deletes the contents of a file. When a file is deleted accidentally or intentionally, Windows just deletes the first byte or the file reference and leaves the file contents stored on the disk. A broken storage medium still has the data stuck in it. Now, the safest method to recover data from failed disks is to take help from qualified engineers.
How do Engineers go about Solving this Problem?
Hardware engineers access most of the disk so that they can produce another copy of it and then give it to software engineers.
Software engineers will use some specialized software made specifically for data recovery. In the end, the final data will be written into the new device. It is quite a lengthy process.
Many specialized software applications are available these days in the market, reducing the complications in the work of the engineers.
Software Applications for Recovery
To name a few:
- The Coroner's Toolkit: This is a checker tool for a UNIX system. It can be used for forensic analysis or after a break-in.
- TestDisk: This is a checker to recover lost or damaged partitions on a wide variety of systems.
- The Sleuth Kit: This is a checker tool for operating systems like UNIX, Linux and Windows.
- CHKDSK: This is a utility tool for DOS and Windows systems.
- DCFLdd: This tool is used for imaging in FreeBSD.
- ILook Iximager: This tool is suitable for governmental agencies.
Now, it is your choice what option you want to choose.
Recovery Tools
Boot disks: These disks are often used when data recovery cannot be performed.
A live CD, boot disk or USB device containing repair tools are often used. While the most common storage devices were floppy drives, the boot disk was explicitly a minimal. Upon viewing the enhanced complexity of operating systems, inclusion of recovery tools with the OS installer on the same media has become very common.
What should you do after the Data is Recovered?
A few points should be remembered after the data recovery:
- Take a full backup of the data you need.
- If the disk is partitioned again and still usable, you can use fdisk to delete the old partition and create new partitions and format them.
- Recreating the partitions is very important because many internal data structures may have suffered damage.
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