Sony VAIO P Microsoft OneCare Defrag and the SSD

I am a big fan of Microsoft OneCare and sad that MS will discontinue it when it releases its free antivirus solution Microsoft Security Essentials. Until Microsoft releases Security Essentials, I plan on using OneCare. However, on the VAIO P with SSD, the OneCare tune up process forces a defrag which is not good for SSD devices and there is no way to easily turn that function off.

After some research I found this thread which addresses the problem by fooling OneCare. You essentially rename the defrag executable in the registry and OneCare ignores the command. There seems to be no error checking so the tune up continues on its merry way without performing the defragmentation.

You should only perform this change to the registry if you are comfortable editing the registry since you could mess up your system.

Before you edit the registry make sure you back it up.

Search for the following key: HKCR\CLSID\{80EE4901-33A8-11d1-A213-0080C88593A5}\LocalServer32 and modify the default value which is currently set to DfrgNtfs.exe to DfrgNtfs_exe.sav .

This will invalidate the defrag executable name for OneCare.

You should also execute defrag from the program menu to configure it and disable its scheduling feature.