How to format a hard drive while logged into its operating system (Windows 7)?

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I seem to have a very weird problem where the computer insists on booting from the hard drive even after setting BIOS to prioritize the CD/DVD drive before the hard drive. I even tried temporarily disabling the hard drive in BIOS just to get it to read from the CD/DVD drive where it simply skipped it and asked for

I seem to have a very weird problem where the computer insists on booting from the hard drive even after setting BIOS to prioritize the CD/DVD drive before the hard drive. I even tried temporarily disabling the hard drive in BIOS just to get it to read from the CD/DVD drive where it simply skipped it and asked for a media storage and then hitting a key.

It wont boot from the disk

I am trying to get it to boot from a recovery disk I made by extracting the files from the original recovery disk (it wouldn't read it for some reason) But now I'm thinking of formatting this hard drive via the Windows 7 OS that is installed in that hard drive.

Other answer:

Christmas Yoshi:
Is this a computer that had windows 8 on it?

If it was this computer has a secure boot and you will have to disable secure boot in bios and enable legacy support and save then your computer will give you a screen with a code which you must repeat before it will change over.

After this go back to bios and confirm that secure boot is disabled legacy support is enabled and f12 boot menu is enabled.

Hope that works for you.

Lee26Caloo大秦後人:
All wrong on what you did.
Recovery disk is not a bootable disk !
You need to install a new copy of Windows 7 first,and then using the recovery disk to put back some extra data files if you stored them before to make the recovery disk.
Go to control panel — back up and recovery —select recovery and guide it loads the recovery CD.
Frostfire:
You can't.
Bill:
The disk your trying to boot off of is NOT Bootable. You did it wrong.

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