1

00:00:00,900 --> 00:00:06,100

In this lesson, let's take a look at the troubleshooting ideas for M.2 hard drives that do not recognize

2

00:00:06,800 --> 00:00:11,633

Unrecognized M.2 hard disk is generally caused by the M.2 interface working conditions not being met

3

00:00:11,633 --> 00:00:13,733

or BIOS setting error, or BIOS damage

4

00:00:15,166 --> 00:00:18,633

We need to solve this kind of failure by adopting the method of soft first and then hard,

5

00:00:18,633 --> 00:00:19,933

first easy and then difficult

6

00:00:20,066 --> 00:00:24,666

First clear the CMOS, or flash a new BIOS to see if the fault disappears

7

00:00:26,066 --> 00:00:29,366

Then check for physical damage near the M.2 interface

8

00:00:31,666 --> 00:00:35,666

After reading these, we will check the working conditions of the M.2 interface

9

00:00:36,233 --> 00:00:39,500

The first is to measure the power supply of the M.2 interface

10

00:00:39,900 --> 00:00:43,933

The power supply of the M.2 interface has multiple pins

11

00:00:43,933 --> 00:00:47,166

If possible, try to measure the power supply of all pins

12

00:00:47,733 --> 00:00:49,400

Further down, the reset signal

13

00:00:49,500 --> 00:00:52,800

The reset signal is 3.3V

14

00:00:53,966 --> 00:01:00,300

Next, measure the 18 PCIE buses of the M.2 interface to see if its ground value is normal

15

00:01:01,466 --> 00:01:05,566

It should be noted here that there is a coupling capacitor in the middle of the PCIE bus.

16

00:01:05,733 --> 00:01:10,133

We must pay attention when we test, skip the coupling capacitor to measure

17

00:01:11,266 --> 00:01:15,666

If there is no problem with the bus-to-ground value, this fault is not easy to repair

18

00:01:15,866 --> 00:01:20,100

We want to measure whether the PCH has received the REQ clock request signal,

19

00:01:21,066 --> 00:01:26,400

and then use an oscilloscope to measure the clock of the PCIE bus to see if it has a waveform

20

00:01:27,700 --> 00:01:30,233

If we have measured all the above and they are all normal, t

21

00:01:30,500 --> 00:01:35,000

hen we can only try to replace the coupling capacitor of PCIE,

22

00:01:35,266 --> 00:01:38,466

or replace a PCH or CPU socket

23

00:01:38,800 --> 00:01:42,733

Because some M.2 hard drives are controlled by the PCH, and some are controlled by the CPU

24

00:01:43,166 --> 00:01:46,800

It can be seen that the maintenance process of not recognizing the M.2 hard disk

25

00:01:46,933 --> 00:01:50,133

is basically the same as that of not recognizing the network card

26

00:01:50,800 --> 00:01:54,533

Both check their working conditions and whether the PCIE bus is normal

27

00:01:56,300 --> 00:02:02,433

We have to know that some mainboards after the 11th generation CPU do not recognize the hard disk in PE,

28

00:02:03,366 --> 00:02:06,566

because the PE version is too old and lacks the VMD driver.

29

00:02:11,100 --> 00:02:16,133

It is recommended that you use the latest version of PE to test if the hard disk is not recognized in PE.

30

00:02:16,500 --> 00:02:20,066

Because the latest version of PE has integrated VMD driver

31

00:02:21,466 --> 00:02:24,700

Don't kill the mainboard by mistake because of PE

32

00:02:25,400 --> 00:02:30,233

Well, the above is the troubleshooting process for those who do not recognize M.2 hard drive failures