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Re: "cannot open volume for direct access" - error message re chkdsk
From Re: Chkdsk Problem - Windows XP and Vista discussion - lenovo community
"The problem is the tvtumon.sys driver, which is now set to load at the kernel initialization stage. This "locks" the boot drive, and causes chkdsk /f and any other program that requires exclusive access to the drive to fail as part of the BootExecute entry in the system registry. The temporary fix is to change the start value for tvtumon in the registry from 1 (loaded by I/O subsystem) to 2 (loaded by service control manager). This fixes the problem with the chkdsk failing on startup, but I'm not sure what it does to RnR 4.2 functionality.
The specific registry entry is:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\tvtumon\] "Start"=dword:00000001
Change the dword to 2 and you are done. Please do not try this if you do not have experience with modifiying system registry entries."
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