Does Reinstalling Windows Wipe All Drives

r/buildapc Show all Partition Selection: During a custom installation, you must manually select which partition to format. If you select only the primary OS partition, other drives and partitions remain untouched. Potential for Errors: It is easy to accidentally select the wrong drive based on size or partition number. Bootloader Risk: Windows sometimes places the bootloader on a secondary drive if multiple drives are connected during installation. If that secondary drive is ever removed, Windows may fail to boot. 3. Best Practices for Safety To ensure no data is lost on secondary drives ( 𝐷 ∶ , 𝐸 ∶ , etc.): Physical Disconnection: The only "100% sure" way to protect secondary data is to physically unplug those drives before starting the reinstallation. Reconnect them once the new Windows setup is complete. External Backups: Always back up critical data to an external hard drive or cloud service (like

When booting from a USB drive to perform a fresh installation: does reinstalling windows wipe all drives

Reinstalling Windows does not automatically wipe all drives. By default, the installation process only affects the specific drive or partition you select as the destination for the operating system. r/buildapc Show all Partition Selection: During a custom

| Installation Method | Wipes C: Drive? | Wipes D:/E: Drives? | | :--- | :--- | :--- | | | ❌ No | ❌ No | | Reset PC (Remove everything) | ✅ Yes | ❌ No (unless "Clean drives" is checked) | | Clean Install (Select C: only) | ✅ Yes | ❌ No | | Clean Install (Delete all partitions) | ✅ Yes | ✅ Yes | | Upgrade Install | ❌ No | ❌ No | Bootloader Risk: Windows sometimes places the bootloader on