Windows 10: Removed Local Disk Operating System

I did something that really really scares me because i don’t know if i can revert this or recover this.I was trying to remove permissions off a user account on my pc. I somehow removed all permissions at all from the pc. I cant access my local disk c on at all. it says it’s not accessible. I tried to hard reset my pc by pressing on the button of the case to turn it off. When it boots back up, it automatically logs into “Administrator” and logs me into a completely new user. In this user, I cannot search anything. I cannot press the windows button in the bottom left nothing pops up when i pres

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Remove spare hard disk as system disk

Thank you for your reply.

There's a possibility that your HDD was detected as OS drive during the Windows installation. To remove your HDD as system disk, we suggest reformatting it. To do so, please follow the steps below:

• Open Disk Management.
• Right-click on your HDD, then select Format.
• On the Format windows, type your preferred Volume label,
  File system (NTFS is recommended), Allocation unit size (leave as Default).
• Check the Perform a quick format option, then click
  OK.

Note: Please back up your files before reformatting the drive.

Feel free to post back should you need further help.

 

Recovering Local Disk

Thank you for your quick response.

It could be a compatibility issue with the latest update and your local disk. We suggest updating your disk driver. Follow these steps:

• On the Start, type Device Manager.
• Locate and select Disk drives.
• Right-click on your disk drive, select Properties.
• Go to the Driver tab and choose Update Driver.
• Once done, click OK.

Update us with the outcome so we can provide further assistance.

 

why do 2 Local Disks get isolated?

This HP has a new SSD. I just now found this and wonder if it is stupids and/or dangerous to try <

"How to delete EFI partition with Diskpart

Step 1. Hit "Windows Key + R to open the run dialogue box, enter "diskpart" and click "OK" to open a black command prompt window.
Step 2. Type "list disk" to display all the disks of your computer. Type "select disk n" to identify which disk you need to work with. Here n stands for the disk letter.
Step 3. Type "list partition" to display all the volumes on the hard drive. Type "select partition n" to identify which partition you want to remove. Here n stands for the volume letter.
Step 4. Type "delete partition override" to remove the EFI partition. Finally, type "exit" to close the windows when you receive the message says, DiskPart successfully deleted the selected partition"

just for a better understanding, but not wanting to complete it, I took these steps >




in this context >




so C: should be using 70GB I assume (461- 391)

Am sure my lack of expert knowledge is showing!