What do I do when I can't deactivate a universal volume?

After using the mobile hard disk or flash memory needs to be removed, we usually perform the "safe removal of hardware" operation, but often encounter "can not deactivate the universal volume" prompts, so that users do not dare to pull out the USB connection.

There are several reasons for this, which is often mentioned in the online tutorials because it opens a file on the mobile hard drive and is in use. If this is the case, close the related program. But most of the time, we've closed all the apps, but we still see this hint.

Two solutions have been introduced: one is to end the Explorer.exe process and the other is to unregister the current user. Admittedly, both methods are valid, but they are not clear about the cause of the problem, and the resolution process is more cumbersome.

In fact, this hint, mostly because the explorer in the background scan read the media file on the hard drive, such as AVI, MP3, etc. This kind of media file information scanning function, often can seriously affect the system speed, resulting in operation is not smooth. The problem can be resolved as long as the prefetch is canceled.

To cancel the Prefetching method:

Enter: Regsvr32/u Shmedia.dll in the Run box to unregister the read-only feature.

Reason analysis: Microsoft's system Shmedia.dll This file provides, originally is a kind of convenient, useful function. With it, when you view media files in the Explorer, you do not need to use other dedicated tools or players, you can see the files related to playback information, such as resolution, playback length, data rate, and even musician information and so on. After you log off the Shmedia.dll, the information is not visible in the resource manager. Disabling it is sacrificing one function to get another convenience. Users can decide how to choose for themselves.

A few users have found that there are times when there is no media file to eject, only restart the computer. This does not eject the situation is not much, the more common reason is the virus in the system, or antivirus software in the background scan zip or rar compression package.