How can I remove the hard disk write protection?

 
What should I do if the disk is write-protected?
1. Go to the system directory c: \ windows \ system32 \ drivers to see if there is any sptd. SYS file. Delete it and restart it. Solve the problem! Note: This sptd. sys is not provided by Microsoft Windows. (It may be that daemon is installed.
Installed on tools)

2.1. The system has a mapped network drive. The drive letter cannot be allocated to the disk.
Solution: disconnect the mapped network drive.

3. The drive letter is hidden.
Solution: Go to the Registration Table (regedit.exe) and go to the HEKY-CURRENT-USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies \ Explorer branch. Find the key value "nodrives" in the path and delete it. Log out and log on again. (Not the NoDriveTypeAutoRun key value ).

4. the disk format is incorrect.
The general USB flash drive uses the HD (Hard Disk fat16) format. If the U disk Startup Program is changed, the format of the USB flash drive may be incorrect. Use hard disk partitioning software such as PQ and PPM to repartition;

5. USB mobile storage device disabled
Please ensure:
[HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ usbehci] "start" = DWORD: 00000004

6. USB flash drive problems.
Solution: format the USB flash drive again. It is best to perform low-level formatting and find a disk tool on the Internet.
No, so the last trick is to reinstall Windows XP!

7. solution: Right-click "my computer", select the "manage" command from the shortcut menu, enter the "Computer Management" window, and expand "Storage/removable storage" in sequence ", click disk management. On the right side of the window, you can see that the operating status of the USB flash drive is "good". This indicates that the disk is correct. Right-click the disk drive letter in the window and select the "Change drive name and path" command in the shortcut menu. In the displayed dialog box, click [change, select an unused drive letter for it. Confirm and exit. Re-open "my computer" and the long-overdue disk drive letter appears.

There are two possibilities!
First. Permission issues. You are not an administrator user (most likely)

Second. Service and group policy not enabled!