Sometimes, users realize their files were only on the desktop (C: drive), which is wiped. Even if the secondary drives are safe, your primary user profile data is gone. How to Ensure "Exclusive" Wiping

I can give you a step-by-step checklist to make sure you don't lose a single file. Share public link

This process intentionally deletes all data across an entire storage drive, resetting its file system so it can store new data.

If you want, tell me which OS and how many drives you have and I’ll give step-by-step actions specific to your setup.

Here is the breakdown:

Result: The installer will only see one drive, making it impossible to accidentally select or corrupt the wrong storage device. Step 3: Identify Your Primary Drive Capacity

If you are comfortable opening your computer case or laptop backplate, disconnect the SATA data cables or remove secondary M.2 SSDs.

By default, a clean installation of Windows or macOS is designed to target the (usually your C: drive). It does not automatically reach out and "sanitize" your secondary D: drive, external backup disks, or secondary SSDs unless you manually intervene during the partition process. How a Clean Install Works

In the installer menu, drive letters (C:, D:) often disappear. You must identify drives by Boot Records:

A typical PC has multiple "volumes" (drives or partitions). For example:

Once the clean installation is complete and you have reached your new desktop: Shut down the computer. Reconnect the cables to your secondary storage drives. Power on the PC.

This comprehensive guide explains exactly how a clean installation interacts with multiple drives, how to protect your secondary storage, and the precise steps to ensure your data stays safe.

A clean installation of an operating system automatically wipe all connected drives by default . It only overwrites the specific drive or partition you select during the setup process. However, a single user mistake during configuration can accidentally erase data across your entire system.

The situation is slightly different when using the "Reset this PC" feature found within Windows settings. This is often mistaken for a clean install, but it offers more explicit choices.

While a manual clean install is targeted, the built-in Windows feature behaves differently based on user choice:

If your Drive D is a partition on the same physical hard drive as Drive C (e.g., a 1TB drive split into C: 500GB and D: 500GB), then a clean install using the "Delete partition" function will wipe both C and D because they are on the same physical disk.