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The HP ProBook 450 G2 is a 15.6-inch business laptop marketed toward private and business users.

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I can't access my primary partition.

I had an “UNMOUNTABLE BOOT VOLUME” blue screen recently. How do I fix it without losing my files on the primary drive? I've partitioned my hard drive into two.

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Which version of Windows are you using? Here's an even tougher questions. Is your BIOS set to Legacy using MBR or is it UEFI BIOS using the EFI bootloader and GPT?

A hint: Look in your BIOS/UEFI and see what the setting.

This video will show you this and much more:

Don't do anything just look at whether it is set to Legacy or variations of UEFI/ and let us know and we will go from there.


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Humor Therapy the UNMOUNTABLE BOOT VOLUME error has a couple of possibilities. Something like:

  • Corrupted system files.
  • Damage HDD / RAM.
  • BIOS error or misconfigured
  • Compromised recent Windows update.

What you do not want to do is to write anything to your HDD. The less you mess with it right now the greater the chances to recover your files. This will be depending on if the HDD has failed or if your partitioning messed things up. Personally I’d start with something like a bootable LINUX Distro disk/ Flashdrive and try to boot from there. Once I have an OS like Linux loaded try to access the HDD and see if your files are still there. If so, back them up to something more secure than your HDD (external HDD would be an option). If your drive is not accessible it is possible that this is a catastrophic failure and your files may be lost. It will all depend on what you find out during further troubleshooting. Let us know and users like @aactech are always willing to talk you through even the most difficult repair.

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Take out your HDD ,PLUG IN into a PC ,Try to boot up with it ,if it works then plug that back into your 450 G2

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