Date Recovery Course

Data recovery means retrieving lost, deleted, unusable or inaccessible data that lost for various reasons.

 

Learn more at the official CDRP Data Recovery Course


Data recovery not only restores lost files but also recovers corrupted data.
On the basis of different lost reason, we can adopt different data recovery methods. There are software and hardware reasons that cause data loss, while we can recover data by software and hardware ways.
Being different from prevention and backup, data recovery is the remedial measure. The best way to insure the security of your data is prevention and backup regularly. To operate and use your data according to the normative steps, you can reduce the danger of data loss to the lowest.

 

Learn more at the official CDRP Data Recovery Course

 

There are so many forms and phenomenon on data problem, we can divide the objects or scope of data recovery according to different symptoms.
System problem
The main symptom is that you cannot enter the system or the system is abnormal or computer closes down. There are complex reasons for this, thus we need adopt different processing methods. Reasons for this symptom may be the key file of system is lost or corrupted, there is some bad track on hard disk, the hard disk is damaged, MBR or DBR is lost, or the CMOS setting is incorrect and so on.
Bad track of hard disk
There are logic and physical bad track. Logic bad track is mainly caused by incorrect operation, and it can be restored by software. While physical bad track is caused by physical damage, which is real damage, we can restore it by changing the partition or sector. When there is physical bad track, you’d better backup your data for fear that the data can not be used any more because of the bad track.
Partition problem
If partition can not be identified and accessed, or partition is identified as unformatted, partition recovery tools such as Partition Table Doctor can be used to recover data.
Files loss

 

Learn more at the official CDRP Data Recovery Course


If files are lost because of deletion, format or Ghost clone error, files restoring tools such as Data Recovery Wizard can be used to recover data.

Data recovery is a process of finding and recovering data, in which there may be some risk, for no all situations can be anticipated or prearranged. It means maybe there will be some unexpected things happen. So you need reduce the danger in data recovery to the lowest:
Backup all the data in your hard disk
Prevent the equipment from being damaged again
Don’t write anything to the device on which you want to recover data
Try to get detailed information on how the data lost and the losing process
Backup the data recovered in time.

 

Virus, format, mis-partition, mis-clone, mis-operation, network deletion, power-cut during operation all may be the software reasons. The symptoms are usually mis-operation, read error, can not find or open file, report no partition, not formatted, password lost and troubled characters.
A: Computer Viruses: some malicious virus programs will destroy data, overwrite, or erase the data contents.
B: Mis-format: fast or completely format partition, thus changing the file system form (NTFS, FAT32) of partition.
C: Mis-Clone: when backing up the hard disk, mis-clone or overlay the original data on hard disk.
For these, we can use software tools to recover it. So called soft recovery means data can be recovered by software, not referring to hardware fixing operation for its fault is not because of hardware failure.
The following are prompts that system can not start up normally:
Invalid Partition Table: Invalid partition table information.
Missing Operating System: “55AA” mark in DOS boot sector lost or DBR corrupted.
Disk Boot Failure: System file read failure.
Bad or missing command interpreter: Can not find command.com file or ‘COMMAND.COM’ file corrupted.

 

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Invalid system disk: DOS boot record corrupted.
Type the name of the command, Interpreter: DOS partition mark in partition table error or ‘COMMAND.COM’ file lost, corrupted.
Error Loading Operating System: Main boot startup program read boot sector unsuccessfully.
Not found any active partition in HDD: Active partition mark in partition table changed as inactive partition mark.
2.Hardware reason Sometimes data loss is because of hardware, such as bad sector in hard disk, power cut, head damage, circuit panel problem, etc.
When your hardware has some problems, you probably will find: the speed of hardware become slow, you cannot operate successfully; you cannot read data, etc, which are most often physical bad track failures.