What are the reasons why the computer hard drive is not recognized

Computer hard drive is not recognized as one of the common problems of hard disk. This time the computer system performance is unable to read the data, unable to identify the hard disk situation, to everyone caused a lot of trouble and inconvenience. If you want to know how to repair the hard disk does not recognize the failure, first we need to understand why the computer hard drive is not recognized? Hard disk recognition is a bit more troublesome, along with hard disk serious physical damage, there is a risk of data loss, some easier to solve, there is no risk of data loss. Generally speaking, there are five reasons why the computer hard disk cannot be recognized.
First: Unable to access and replicate data due to hard drive bad channel
When you enter the operating system, you can see the data on the hard disk, but you cannot access the data, and you cannot copy and paste the data. This situation, basically can be determined that there is a bad path on the hard disk, there may be a problem with the hard drive firmware, you can use Windows's own tool to check the bad path of the hard drive if there is a bad word, if it is not a bad problem but a firmware problem, it is recommended to the professional diagnosis.
Second: The firmware issue causes the hard drive to be detected in the BIOS
When the computer is started, the hard drive is not detected in the BIOS, but the hard drive is functioning properly. This situation is basically caused by a firmware problem, or it may be the loss of hard disk initialization information. If this occurs, the data is not backed up, it is necessary to undertake a large risk of data loss, it is recommended to consult the Day Shield Data Recovery Center engineer, Open Data recovery, perhaps there is a chance to repair.
The third type: Hard disk failure caused by head failure
When the computer hard disk issued "Da Da" sound or other abnormal sound, it indicates a problem with the head. At this time, should shut down the computer immediately, the hard drive to the professional repair site repair, otherwise, the data file on the hard disk will be lost.
Fourth type: Hard drive motor problems
When the power is switched on, the computer is turned on, and the hard drive is not found in the BIOS. If this happens, most of it is caused by a problem with the hard drive motor.
Fifth type: Hard drive error identification
When using a computer, it is found that the computer hard drive detected in the BIOS is different from the actual hard drive. This situation is due to the drive head offset, there may be a problem with the hard drive firmware, causing the hard drive to be mistaken.
When the hard disk does not recognize the situation, do not panic, we can through the above five reasons for the analysis of the hard disk failure to make a preliminary judgment. When the problem is identified, do not blindly operate, if you have important data on the hard disk, may wish to contact the Day Shield Data Recovery Center , let professional engineers to help you free diagnosis.

What are the reasons why the computer hard drive is not recognized