Disk isn't found when Legacy Support is disabled

[Bartekkap4]

Hello,

I'm having issues with My HP 655 notebook.

2 monthes ago I updated BIOS from F.02 to F.29, After that I saw in BIOS that in system configuration > Boot order I'm able to Disable or enable Legacy Support. But when I Disable Legacy Support, after restarting, notebook throws error 3F0:

Boot Device Not Found

Please install and operating system on your hard disk.

Hard disk (3F0)

...

(I Don't have curretly installed any OS because I wanted to install windows 7 or Some Kind od Linux on this notebook).

I would be do grateful if someone responded. ^_^

[Bartekkap4]

I forgot to add: I have changed from HDD to SSD on this notebook and I have upgraded Ram from 4 to 6 GB

[Paul_Tikkanen · Accepted solution]

Hi:

That happens because you have Windows installed in Legacy mode which creates the MBR partition table on the hard drive.

When you disable Legacy mode, that changes the BIOS to look for and boot from a drive with a GPT partition table.

Since two types of partition schemes use different boot files and structures, the PC can't find the MBR drive it used to boot from.

In an old notebook like yours having a drive with a GPT partition table is not very important unless you want to boot from a drive that is larger than 2 TB.

You either have to reinstall Windows by booting the installation media from a UEFI boot source (if your notebook supports booting from two sets of boot sources--Legacy and UEFI).

If your notebook does not show two sets of boot sources (legacy and UEFI) do not try and install Windows in GPT mode.

Anyway, if you change the setting back to Legacy, the notebook should boot up again like normal.

[Bartekkap4]

Thanks for reply 🙂

[Paul_Tikkanen]

You're very welcome.