What’s the heck?

Look at the BootRacer history on my Windows 7 64-bit Ultimate.

It is incredibly slower  46.375 sec than normal 25-28 seconds.

I compared the slow boot  with the previous one using the BootRevealer.

The problem began after starting the Session Manager:

I checked the most often used files.

Here I found the strange results:

Who needs the Hiberfil.sys? Surprise.

Detailed activity log:


Seems like the process reads the data from ‘hiberfil.sys’ and writes to ‘System Volume Information’. It is about 370 Mb read and the same written during normal Windows boot-up.

But why?

Who is need the ‘hiberfil.sys’?

I did not use hibernation at all.

The Windows system uses standard “balanced power plan” with sleeping after 30 minutes of inactivity. Hybrid sleeping is disabled.

Another strange thing:

The written file is deleted.

I explored the event log:

Event Source:                  VolSnap

Event Category: None

Event ID: 25

Volsnap driver is related to Microsoft Volume Shadow Copy Service.

Here is a great article about it:


I have no problem with free disk space on the drive: 450 Gb is free, 14.8 Gb is used.

Looks like the problem is in high load:


Shadow copies are lost during backup and during times when there are high levels of input/output”.

Of course the Windows boot-up process is not good time for backup.

It is very strange for me, why the VSS did not wait for more comfortable time.

As a result I had the boot delay and lost all restore points.

Looks like there is no hotfix of the problem for Windows 7.

One positive thing:

I know what happened.
There is not any  secret in the Windows boot-up process.

As workaround, I  turned off ‘hiberfil.sys’, because I don’t use it,  using the simple command:

powercfg -h off

Also, I know how to turn it on: powercfg -h on