Solid state drives (SSDs) can read and write fast. However, if they lose power for several times, it will be miserable - hit the disaster that the computer can't find the hard disk when it starts up! What should I do? There are "30 minutes" rescue methods on the Internet, which are reproduced below for future use:

http://forum.crucial.com/t5/Soli ... y-system/ta-p/65215

This is what yingruida said on its website

Desktop

Step 1: connect the SSD only to the SATA power cord, turn it on, and wait for 20 minutes. Do not use the computer during this period.

Step 2: shut down, unplug the SATA power cord and wait for 30 seconds.

Step 3: connect the SSD only to the SATA power cord, power on and wait for 20 minutes. Do not use the computer during this period.

Step 4: shut down, unplug the SATA power cord and wait for 30 seconds.

Step 5: connect the SATA power cable and data cable to the SSD and start the computer.

Step 6: upgrade to the latest firmware (it's up to you)

Notebook (USB hard disk box is not recommended)

Step 1: boot and enter BIOS. Wait 20 minutes. Do not use the computer during this period

Step 2: shut down, unplug the SSD and wait for 30 seconds.

Step 3: connect the SSD. Boot and enter BIOS. Wait 20 minutes. Do not use the computer during this period.

Step 4: shut down, unplug the SSD and wait for 30 seconds.

Step 5: connect the SSD. Power on.

Step 6: upgrade to the latest firmware (it's up to you)

For APPLE notebook, you must start the computer to the open firmware

PS. if the SSD is lost, do not restart continuously. This is because the SSD is accidentally powered down due to forced restart or shutdown just now. At this time, the SSD is likely to check and repair errors internally. The SSD in this state will cut off all contact with the outside world, so the hard disk light will not flash. If you restart or shut down the SSD at this time and interrupt the operation of the SSD, it may lead to more serious consequences, especially repeated restarts, which will turn the SSD that can be repaired by itself into a complete error. The most serious consequence is that you can only apply for repair. Many Meguiar users should know that there is a 30 minute method. Similarly, for any SSD, you only need to wait patiently for 20-30 minutes at this time. I suggest that those who have no patience should wait more than 15 minutes and restart the machine. Generally, SSD will recover. Personally, I prefer to wait in the BIOS interface. Generally, after restarting, I directly enter the BIOS to check whether the SSD is detected. If the disk is lost, I will wait directly. If not, just exit the BIOS and enter the system.

PS. suppose in SSD Firmware, Each Page is marked with "who am I" and FTL records "who is where". When FTL is partially or completely damaged due to various unpredictable reasons mentioned above, we lose "who is where" Naturally, we can't find the data we want. Now let's do a reverse push operation, and do a complete scan for the whole Page. The scanning speed depends on the capacity of the SSD, that is, the origin of "30 minutes". Let each Page report "who am I" once, and then regenerate an FTL record according to this report, so that all or most of the user's data can be recovered, That is, from the original "brick" to the state of re recognizing SSD. As for the feasibility of this operation method, for example, two data point to the same LBA. How can we judge the old and new of the two data? It is the essence of the design of Mei Guang firmware. Can the recovery operation have a graphical interface? In this way, users at least know that their disk is being repaired. The answer is No. ATA protocol does not support it.

PS. what about SSD crash and Caton? Detailed explanation of SSD use

1, Crash Time SSD is more serious than mechanical hard disk?

In fact, the crash of SSD is not concentrated in SSD In fact, it is the whole problem related to the hard disk. Many users think that the crash itself is the problem of solid-state disk. In today's article, we also analyze what the system crash is.

Let's take a look at the main aspects of crash. What is a normal crash and what is an abnormal crash:

False crash

1: The screen freeze caused by the program jamming can't even be seen by the mouse pointer, but WIN7 Available Ctrl+Alt+Del Switch to login/Forced logout or restart in the logout interface;

2: If the computer fails to respond for any reason, the mouse and keyboard are locked and cannot be operated. After a period of time, the computer will have a blue screen and restart automatically or manually;

3: Failure to respond to user operation in a short time due to system busy, and recover after a period of time;

4: The screen is basically fixed, but the mouse and keyboard are not locked. The mouse pointer can move on the screen, but the machine does not respond when clicking on any object. After a while, the blue screen will be displayed;

5: The computer screen is black, but the keyboard and mouse are not locked. The sound can be heard during audio and video playback is still normal.

Normal crash

1 : The computer suddenly turns blue without any warning, and does not restart automatically for a long time;

2: The computer screen is frozen, the key and mouse are locked, and there is no response. When the user presses RESET It will not restart before;

3: The computer screen is black, the keys and mice are locked, and abnormal sound can be heard during audio and video playback.

Some of the phenomena in the above examples are very similar, which are often mistaken by users as the performance of crash. In fact, it doesn't matter whether the crash is true or false. The main thing is whether it is really related to the health of our solid-state drives. Now? SSD Many users will find exceptions after restarting directly. For example, the system may be unable to enter because important files are damaged, or even SSD There is a loss, which we used to start BOOT Options are missing, as mentioned in.

The reason for this is that when we restart, SSD The data may be being transmitted. Because the action of restarting interrupts the transmission, the data may have an error. This operation will also affect the HDD and SSD Impact

We have mentioned in many technical articles that the biggest writing difference between solid-state disk and mechanical hard disk is that the files in an index area must be wiped out first, and then written, while mechanical hard disk can be directly covered. And consumer grade SSD Used MLC Flash memory particles are relatively common in the enterprise SLC For example, an accidental power failure is naturally better than HDD More sensitive.

2, If SSD crashes: do not restart blindly

The current power down protection measures have begun to be popularized in many technology manufacturers, but what should we do if we crash when using solid-state drives.

We all know that soft restart is Ctrl + Alt +del，In fact, pressing the arrow keys and other direction keys while soft restart can also play the role of restart. If you can restart your computer correctly, don't easily choose hard restart.

In other cases, it is generally recommended to wait for the system to restart automatically. If it does not restart automatically, it is also recommended to wait at least 10 minutes before manually pressing RESET to forcibly restart. At the same time, pay attention to the hard disk light. If the hard disk light is on or flashing, do not operate. After it is determined that it cannot be restarted, forcibly restart it

As for the fourth false crash, this is a typical case of system hard disk loss. Because there is still data in the memory, the mouse can operate on the current screen. Just because the system disk is lost, no response is made to any operation. In this case, if the hard disk light is not on, you can directly force a restart.

But after everyone restarts, if SSD In case of loss, do not restart continuously. This is due to the forced restart or shutdown just now SSD Accidental power failure, at this time SSD It is possible to check and repair errors internally. In this state SSD It will cut off all contact with the outside world, so the hard disk light will not flash. If you restart or shut down at this time, you will be interrupted SSD The operation may lead to more serious consequences, especially repeated restart, which will make the original SSD The situation that can be repaired by itself becomes a complete error. The most serious consequence is that you can only apply for repair.

The system cannot BOOT to quickly solve the problem of BOOT loss

Many Meguiar users should know that there is a 30 minute Dafa, the same as any other SSD，At this time, just wait patiently for 20 minutes-30 Minutes. I suggest waiting for more than 15 minutes before restarting the machine. Generally SSD Will recover. I personally prefer to enter BIOS Wait on the interface. Generally, after restarting, you can enter directly BIOS，inspect SSD Is it detected? If the disk is lost, just wait. If not, exit BIOS Just enter the system.

summary

More and more attention is paid to the phenomenon of crash and jamming. Many users do not consider the working principle of solid-state disk itself. Even for mechanical hard disk, the probability of bad track caused by frequent forced restart will be doubled, and the probability of losing system startup file will also be increased.

In fact, many hard disk hangs are inseparable from the accumulation of long-term forced restart. The knowledge point mentioned in this article is to hope that readers can realize the harm of forced restart. In order to ensure the safety of data and hard disk, please think twice before hard restart.
Transferred from: http://blog.sina.com.cn/s/blog_51fb00840102xfgf.html