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- PA, USA
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- Win 11 Home ♦♦♦26100.3775 ♦♦♦♦♦♦♦24H2 ♦♦♦non-Insider
So if I choose the Nothing option on the Choose what to keep screen, it'll only format the system partition i.e. C:?
If you're gonna choose: Keep nothing, you might as well do a clean install.
Maybe you should post a screenshot, so we understand what you're talking about.
IF I understand what you're asking...
An In-Place upgrade doesn't affect other drives or partitions, like a clean install can.
Generally, when you do a clean install, you temporarily unhook all other drives, so the installer doesn't stick the recovery or EFI partitions on some other drive.
Here's a screen of my Disk Management. An In-Place upgrade only affects what's in the RED rectangle.

An In-Place upgrade is NOT a format... it's a repair. It compares what's in the ISO image with what's on your drive.
If it finds a mismatch, it replaces the item on your drive, with the item from the ISO image.
Repair Install Windows 11 with an In-place Upgrade
This tutorial will show you how to do a repair install of Windows 11 by performing an in-place upgrade without losing anything. If you need to repair or create a new recovery partition or having problems with the Windows 11 operating system on your PC, and the usual solutions will not fix it...

On a clean install the ISO image is bootable and is on a USB stick.
It erases (formats) then installs a complete fresh copy of Windows.

Clean Install Windows 11
This tutorial will show you step by step on how to clean install Windows 11 at boot on your PC with or without an Internet connection and setup with a local account or Microsoft account. Windows 11 has all the power and security of Windows 10 with a redesigned and refreshed look. It also comes...

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My Computers
System One System Two
-
- OS
- Win 11 Home ♦♦♦26100.3775 ♦♦♦♦♦♦♦24H2 ♦♦♦non-Insider
- Computer type
- PC/Desktop
- Manufacturer/Model
- Built by Ghot® [May 2020]
- CPU
- AMD Ryzen 7 3700X
- Motherboard
- Asus Pro WS X570-ACE (BIOS 5002)
- Memory
- G.Skill (F4-3200C14D-16GTZKW)
- Graphics Card(s)
- EVGA RTX 2070 (08G-P4-2171-KR)
- Sound Card
- Realtek ALC1220P / ALC S1220A
- Monitor(s) Displays
- Dell U3011 30"
- Screen Resolution
- 2560 x 1600
- Hard Drives
- 2x Samsung 860 EVO 500GB,
WD 4TB Black FZBX - SATA III,
WD 8TB Black FZBX - SATA III,
DRW-24B1ST CD/DVD Burner
- PSU
- PC Power & Cooling 750W Quad EPS12V
- Case
- Cooler Master ATCS 840 Tower
- Cooling
- CM Hyper 212 EVO (push/pull)
- Keyboard
- Ducky DK9008 Shine II Blue LED
- Mouse
- Logitech Optical M-100
- Internet Speed
- 300/300
- Browser
- Firefox (latest)
- Antivirus
- Bitdefender Internet Security
- Other Info
- Speakers: Klipsch Pro Media 2.1
-
- Operating System
- Windows XP Pro 32bit w/SP3
- Computer type
- PC/Desktop
- Manufacturer/Model
- Built by Ghot® (not in use)
- CPU
- AMD Athlon 64 X2 5000+ (OC'd @ 3.2Ghz)
- Motherboard
- ASUS M2N32-SLI Deluxe Wireless Edition
- Memory
- TWIN2X2048-6400C4DHX (2 x 1GB, DDR2 800)
- Graphics card(s)
- EVGA 256-P2-N758-TR GeForce 8600GT SSC
- Sound Card
- Onboard
- Monitor(s) Displays
- ViewSonic G90FB Black 19" Professional (CRT)
- Screen Resolution
- up to 2048 x 1536
- Hard Drives
- WD 36GB 10,000rpm Raptor SATA
Seagate 80GB 7200rpm SATA
Lite-On LTR-52246S CD/RW
Lite-On LH-18A1P CD/DVD Burner
- PSU
- PC Power & Cooling Silencer 750 Quad EPS12V
- Case
- Generic Beige case, 80mm fans
- Cooling
- ZALMAN 9500A 92mm CPU Cooler
- Mouse
- Logitech Optical M-BT96a
- Keyboard
- Logitech Classic Keybooard 200
- Internet Speed
- 300/300
- Browser
- Firefox 3.x ??
- Antivirus
- Symantec (Norton)
- Other Info
- Still assembled, still runs. Haven't turned it on for 15 years?