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Is it safe to delete the DELL created partitions when upgrading OS
My DELL Latitude laptop came with Windows 8.1 Pro x64 on it. I decided that I want to upgrade it to Windows 10 Pro x64.
Before I did anything I used DELL Backup and Recovery to create a flash drive so I can always restore the PC back to factory if anything goes wrong during the upgrade process.
After creating the recovery media I used the Windows 10 upgrade wizard to upgrade to Windows 10 carrying over all of my existing files. I primarily did this so my Windows 8.1 Product Key which is injected into the motherboard would officially become a Windows 10 Product Key.
Now I would like to do a 100% clean install of Windows 10 through a bootable Windows 10 USB flash drive that I just got done creating but have a few questions:
I booted from the flash drive and went to Custom (Advanced) install and I am currently viewing all of the partitions:
Drive 0 Partition 1: "ESP" type: (System)
Drive 0 Partition 2: "DIAGS" type: (OEM)
Drive 0 Partition 3: "" type: MSR (Reserved)
Drive 0 Partition 4: "WINRETOOLS" (Recovery)
Drive 0 Partition 5: "OS" type: (Primary)
Drive 0 Partition 6: "" type: (Recovery)
Drive 0 Partition 7: "PBR Image" (Recovery)
Which of these are DELL related and which of these are just the additional partitions Windows automatically installs?
Can I just delete them all and fresh install Windows 10 on Unpartitioned space?
Is there any that are non operating system related and might be worth keeping like the DIAGS one?
Will my DELL Backup and Recovery media rely on any of these if I delete them and then try to use it later on?
Is there any use for any single one these anymore now that I have backup recovery media and will be going to Windows 10?