The laptop is installed with a system, plugged in the U disk, only the removable disk is displayed,

When you installed the system, you just partitioned the hard disk, but you must format the hard disk before it can be used normally, so you didn't format the hard disk, and now you can't see the hard disk when you enter the operating system. It must be formatted, you can use the DOS operating system, which is the command prompt, enter the following command: format d:

This is to format the D drive, repeat this operation to format the other disks) and reboot! Don't move on to the other options and let it go on its own, as there is a hard drive self-test before turning on the desktop, as this is a must. Or you directly ** hard drive partition magician to partition and format the hard disk.

Because your hard disk has not been formatted, the USB flash drive you plugged in will also prompt you to format it, and if you want to use the USB flash drive, it will be plugged into another machine. Also, when formatting, it is recommended that you use ntfs to format the U disk, and the formatting command is like this: format d:

fs:ntfs

I don't understand very clearly... You see if it's wrong in the device manager. See if there's any problem with the property formatting...

Try it here... I really can't ... That's just a repair tool to try...

No more... Only... Reimbursed...

How to modify a partition that has been changed to a raw file system.

RAW file system repair.

Method 1 (Data Retention Method):

You can try it like this: Enter"Control Panel"Found"Management tools"to turn it on, in the will"On-premises security policies"Open, in will"Security options"Open and find it in the window on the right"Network access: Shared and secure mode for local accounts"After"Guests only"Instead"Classic", exit back to my computer, and right-click on the D drive to find it"Safety"tags, delete the garbled characters, and then add the user of the computer.

Note: This method may also be used for partitions that were previously NTFS formatted. It is roughly the same as Method 3.

Method 2 (Unable to retain data):

Use Control Panel – Administrative Tools – Computer Management – Disk Management.

Delete and re-establish the partition.

Method 3 (Data can be retained, and the original partition format is NTFS format):

Click"tools"--"Folder options"- put"Use simple file sharing", the RAW format partition (formerly NTFS partition format) is there"Security options", and then set the permissions again, and it's OK.

Method 4 (theoretically should be able to retain the data, untested):

Use DM partitioning software to see if there are any partition table errors, or use PQ software to restore the partition to FAT32 or NTFS format.

Method 5 (Someone else's method can keep the data.) ps: It feels like it's troublesome):

Here's how:

1. Use EasyRecovery Pro and select Data Recovery --- Advanced Recovery (select Advanced Option to customize the data recovery function);

2. Select the drive letter that has been changed to RAW format, and click Advanced Options in the lower corner;

3. In the file system scan, select the file system"ntfs", click Advanced Scan, and select in the lower-right corner"Advanced options"to set the cluster size and data start position to 0;

4. Click on the partition settings and use the MFT method (this must not be wrong); Then determined;

5. Click Next to start scanning the file system, and then wait for a long time, be patient. After completion, you will find that an NTFS drive letter has been found, and then click on the found drive letter to start scanning;

6. After the scan is completed, you will find that all the files have been found, then click Recover, and select an available disk to store your recovered files;

7. Finally, format the disk with the problem, copy the recovered files back, OK, everything is in good condition.

One is not in good contact, the quality of the second disc is poor, and the third disc has a problem, and the second is generally excluded, it is likely that your disc is broken....

When the file exceeds the actual capacity, the data is lost, unreadable, and garbled.

2. Write protection.

It does not have a write-protection function (button), and after a period of use, the main control chip fails, and the data cannot be stored and changed, prompting write-protection.

3. Prompt formatting and cannot complete formatting.

The main control chip is faulty, and the flash memory chip cannot be identified; The flash memory chip is damaged and cannot be completed.

4. Prompt to insert the disk.

The flash memory chip is damaged, the disk attribute changes to raw (raw), and the main control chip cannot detect the valid storage medium, so it opens the prompt to insert the disk.

In short: copycat USB flash drives are mostly made of scrapped flash memory chips or even black chips with a large number of bad blocks, due to inferior hardware, the data is extremely unguaranteed, and it is recommended to throw it away.

It must be a broken USB flash drive, take it out for repair.

The system went wrong. Restart the next 、、、 and not reinstall the handle.

Change the interface and use the interface behind the host.

Check if the USB flash drive is locked!

It may be that the memory card is broken, or the 6 metals of the memory card are dirty and wiped clean.

Right-click on the property, mark it as active, and try it.

1. Right-click "My Computer" and select the governance command in the pop-up shortcut menu to enter the computer governance window.

2. Store Removable storage in turn, click the disk governance item, and on the right side of the window, you can see that the U disk is running in good status, which means that the U disk is fine.

3. Right-click the U drive letter in the window, select the Change Drive Name and Path command from the shortcut menu, and in the dialog box that appears, click the Change button to select an unused drive letter for it. Exit after you are sure. Turn My Computer back on.

Go to the system directory C: Windows System32 Drivers to see if there is a file, delete it if there is, and reboot it. Note: This is not something that comes with Microsoft Windows.

2. Find the key value of nodrives in the path, delete it, log out and log back in. (not the nodrivetypeautorun key).

You go to other computers to try to see if the USB flash drive can be used, if not, the USB flash drive is broken.

You can see in My Computer-Computer Management-Disk Management, if you can find it, open it in **Open it, and format it.

You right-click on my computer, then click on manage, then click on disk management to see if you can see it.

Try a different computer.

If more than one is like this, it's broken.

It's the registry in your USB flash drive that is damaged, and you should have pulled out the USB disk without safe deletion when you were using it, which is a software problem. It's good to format it, if there's something in it, find a data recovery software to get it out, and then format it to use.

Select My Computer--- right-click on Manage---Disk Management - see if there is a USB flash drive -

If it is not confirmed that your USB flash drive is broken.

In this case, the USB flash drive file is hidden, and the way to find out the hidden file is:

Method 1: Take the "My**" folder of G drive as an example: click the "Start" button, enter cmd in the run, start the ms-dos window and enter the command: attrib g:

My**"-s -h -r After entering, look at the U disk, and "my**" appears again.

If you want to display all the files on the G drive, you can enter attrib g:"*"-s -h -r s dattrib syntax paraphrasing:

r sets read-only file properties. -r clears read-only file attributes. +a to set archive properties.

a Clear archive attributes. +s to set system file properties. -s clears system file attributes.

h Set the hidden file attributes. -h clears hidden file attributes. s applies attrib and any command-line options to matching files in the current directory and all of its subdirectories.

d Apply attrib and any command-line options to the directory. Show help at the command prompt.

Method 2 introduces one of the simplest methods that is almost universally known.

Newbies must know that this method can only restore hidden files simply, when encountering "stubborn" symptoms, please use method 1 to open the USB flash drive, click the "organization" button in the menu bar in the upper left corner (win7).

If these two methods can't be solved, then you can only turn to professional software.

It may be a problem with your computer, and my USB flash drive has also encountered this problem, and then I left it alone.