Does Reinstalling Windows Wipe All Drives Official

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

During this process, Windows may ask if you want to clean "Only the drive where Windows is installed" or "All drives" . If you select "All drives," any secondary HDDs or SSDs connected to the system will be formatted. 2. "Clean Install" (Using USB/Installation Media) does reinstalling windows wipe all drives

To understand why this misconception persists, one must look at the default behavior of the Windows installation media. When a user boots from a USB drive to reinstall the operating system, the setup environment presents a screen asking where the user wants to install Windows. This screen displays a list of drives and their partitions. Crucially, the default selection is usually the primary drive (often Drive 0). If the user simply clicks "Next" without manipulating these partitions, Windows effectively overwrites the previous system files but may leave user data intact in the "Windows.old" folder. Furthermore, this screen treats every listed drive as a separate entity. If a computer has a secondary hard drive (Drive 1 or Drive 2) installed for storage, the Windows installer ignores them completely unless the user manually selects them and initiates a format. Consequently, a user can reinstall Windows on their C: drive while every photo, document, and video on their D: drive remains perfectly preserved. r/buildapc Show all Partition Selection: During a custom

When booting from a USB drive to perform a fresh installation: Bootloader Risk: Windows sometimes places the bootloader on