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Hello everyone, in this lesson we will take a look at the maintenance of non-recognized SATA hard drives

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First of all, let's introduce the SATA hard disk

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SATA hard drives generally have two interfaces, the short interface is used to transmit data,

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and the long interface is used for power supply

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The power supply of SATA hard drives generally does not come from the mainboard, but from the power supply.

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Therefore, the power supply of SATA hard drives generally does not require us to pay attention

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And the data of SATA hard disk is also very simple

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It has a total of 4 data wires and 3 ground wires

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Under normal circumstances, we don't need to take care of these 3 ground wires,

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we only need these 4 data wires to be normal.

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Therefore, it is relatively simple to repair the SATA hard disk without recognizing it.

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Let's first look at the situation that a single interface does not recognize the hard disk

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This failure is most likely caused by the interface circuit

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We still follow the principle of soft before hard

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Clear the CMOS settings first, and check for physical damage around the SATA interface

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After checking these, let's check whether the 4 data lines are normal

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We only need to measure the ground value of these 4 data lines

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It should be noted that there is a coupling capacitor in the middle of the SATA bus of most mainboards.

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So we must skip the coupling capacitor when measuring, and measure at this end of the PCH

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If there is no problem with the ground value,

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we can only try to replace the coupling capacitor or flash the BIOS

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If all interfaces do not recognize the hard disk,

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it means that the fault is not caused by a certain interface, usually the PCH is faulty

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For this kind of failure, we should first make it soft and then hard

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Clear the CMOS settings first, and check for physical damage around the PCH

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After checking these, we have to measure whether all the power supplies of the PCH are normal

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Because the inside of the PCH is generally a module by module

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All SATA interfaces are unavailable, indicating that the SATA module is not working

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It may be that the SATA module lacks power supply

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If these are normal, then we can only flash the BIOS, or change the PCH

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The above is the maintenance process of SATA hard disk