Data recovery and how to diagnose the hard drive physical failure

All computer have hard disks. Once the hard disk are damaged,  the data stored on hard drive may be lost. That must be a great loss for anyone. So we need to pay attention to check the hard drive regularly, and know how to diagnose the external physical failure.

Now let us take a look at what are the difference between solid-state hard drive and regular hard drive.

1. Solid-state hard disk has a faster read and write speed.  Since the solid-state drive uses flash memory as its storage medium, it will be faster, compared with mechanical hard disk. SSDs have no head, seek time is almost zero. SSD’s sustained read and write speed is more than 500MB / s, which far more than the regular hard disk speed of 100MB / s.

2. SSDs are more shake-proof and have a lower noise. Since in the internal of solid-state hard drive, there is not head. Its operating temperature range is relatively wide. Because there is no mechanical motor and fan in a SSD, the operating noise is almost zero. It has no internal mechanical moving parts, causing no mechanical failure and no collision or vibration.

3. The SSD has a restricted life. SSDs have a fixed number of times to read and write. But the regular hard disks are less affected from read and write.

Then we can take a look at the  hard disk physical failure detection.

As we all know, hard disk failures are divided into physical and logical failure. Here I’d like to talk about the diagnosis of  physical failure.

External hard drive failures mainly refers to the circuit board failure. Hard drive circuit board is generally divided into six panels. Circuit boards mainly have the main chip, cache, motor driver chip, BIOS and electronic components, etc. Circuit boards the failures are generally as follows:

1.A power supply failure.

The power of hard disk mainly from the switching power supply of host. Four terminal voltages are: red for positive 5V, black for the earth, yellow is positive 12V. Use the linear power to convert circuits, converting into the voltage the  hard disk need for  normal working. If there is a problem in power supply circuit of hard drive, the hard disk can not work. The performance can be no power, can not detect hard disk,  the disc does not rotate, the head does not seek. Parts of the power supply circuit often have problems: the socket terminal, filter capacitors, diodes, transistors, and insurance resistors.

2.Interface failure.

In fact, the interface is the path to transfer data between the hard disk and the computer. If the interface circuit fails, it may lead to a hard disk is not detected, messy code, parameters misidentification etc. Parts of the interface failure are usually interface chip and its matching crystal, broken interface pins, empty solder interfaces, interfaces exclusion damage and so on.

3.Cache fault.

Caching is used to speed up the hard disk data transmission. If there is a problem, it may lead to the hard disk cannot been recognized,  appearing messy code and abnormal crash.

4.  BIOS failure.

BIOS is used to save parameters such as hard disk capacity, interface information etc. All the hard work processes are related with BIOS . The moment of electricity on off may lead to the loss or chaos of BIOS program. If BIOS is abnormal, the hard drive can not recognize.

Therefore, if the hard disk is damaged, you can ask Hdata recovery engineers to help you.