Question: Ok, so I know what hiberfil.sys is, and I want to use hibernation on my laptop.

But I have another hard drive active in my laptop, it's taken from my old one... and I want to get rid of the hiberfil.sys on that drive. But even with admin privileges I can't delete it.

Any ideas?

Answer: 
If you really, really want to get rid of the file, you can always boot to something like a Linux or Windows PE boot disk, and then delete it.

If it was placed there by the current OS, it will come right back. However, from your wording, it sounds like it was placed on the old HD by an old OS that was on it.
**Right click the drive**, click **Properties**, and go to the **Security** tab.

Use the **Edit** button to give **Full control** to Users and Authenticated Users.

After that, you should be able to delete the file via the command prompt (make sure that you're using the correct current directory):

```
del /f hiberfil.sys

```

That should get rid of the file. I recommend changing the permissions back afterwards.

[![enter image description here](https://i.stack.imgur.com/X3hTp.png)](https://i.stack.imgur.com/X3hTp.png)