Win7 system mobile hard disk can not be safely deleted how to do

Friends who use U disk, MP3, MP4 or mobile hard disk may often encounter the problem of "can't safely delete", how can the win7 system solve this problem?
Safely remove the hardware to protect the hard disk. A program that was destroyed. The purpose of safely removing the hardware is to return the hard disk head and no longer read or write to protect the hard disk. In XP, after the hard disk is safely deleted, the mobile hard disk will be powered off and stopped. And vista and win7 safely remove the hardware, it will not cut off the power connection, only the data connection is disconnected, that is to say the hard disk continues to rotate, but it can be pulled directly. But sometimes you can't safely delete the hardware:
What if you encounter this situation?
(1) Use unlocker, a free right-click extension tool.
After installation, right click on the U disk, select unlocker to unlock, and then delete it safely.
This is a non-basic basic method. If not, please skip to step (2) to solve it.
I used unlocker 1.9.0 to unlock the mobile disk and found that the explorer.exe process is accessing the disk. Therefore, all unlock operations are performed. It is reasonable to say that the mobile hard disk should be safely deleted at this time. However, but an operation, it still prompts that the hard disk is in use and cannot be safely deleted.
(2) Another reason for the inability to safely delete is that some software processes prevent the removal of the mobile hard disk, such as some anti-virus software, win7's own process and QQ.
The specific solution is: right click "My computer" - "-" "& management"   "--" "Event Viewer" - "-" "  "windows logs" - "-" “System”, find log messages with yellow warnings.
What I found was that the application with process ID 2468 DeviceHarddiskVolume1WindowsSystem32svchost.exe stopped the removal or eject of the device USBVID_1058&PID_071A575850314533304658433836.
The win7 process has more than ten svchost.exe, our job is to find svchost.exe corresponding to process ID 2468, end the corresponding svchost.exe, and then you can safely delete the hardware.
Of course, some people have seen this information: The application with process ID 1128 DeviceHarddiskVolume4ProgramFilesTencentQQBinQQ.exe stopped the removal or eject of the device USBVID_1058&PID_071A575850314533304658433836.
This means that this is caused by QQ. After quitting QQ, after waiting for a few seconds, click to delete the mobile hard disk, it should be safely deleted.