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Originally Posted by Micah Cohen
U
What the heck is "svchost.exe"?
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SvcHost.Exe is the Process that "hosts" individual service DLLs. When you look in Control Panel->Administrative Tools->Services, some of those that are started are running under svchost.exe, because library code needs a process to link to, so MS created a generic executable process for all service libraries to run under. There are other system services that run under that process as well.
http://support.microsoft.com/?kbid=314056
As far as your hard drive always spinning, check things like Windows Defender or the File Indexing Service, these are notorious for running when the system is at idle.