Select that unallocated space and click "Next" to let the installer format it and install the fresh OS. Step 4: Reconnect Your Drives
The installation wizard allows users to delete partitions to create unallocated space. Clicking "Delete" on a partition belonging to a secondary backup drive will instantly destroy the file system structure on that drive. 3. Automatic Drive Reordering
Once the clean install finishes and you boot into your fresh operating system, your secondary drives may not show up immediately in File Explorer. This is normal and does not mean your data is gone.
Can I reinstall Windows 10 without losing my files? - Lenovo does clean install wipe all drives exclusive
While the process is designed to be surgical, there are "exclusive" scenarios where other drives could be at risk:
Even if the program files are located on a secondary drive, most traditional software installs crucial registry keys and system files onto the primary C: drive. You will need to rerun the installers for these programs to make them work again. Final Verdict
This is where Windows or macOS lives. During a clean install, this partition is formatted. Everything on it—your documents, your desktop files, and your installed programs—will be deleted. Select that unallocated space and click "Next" to
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This core principle holds true whether you are using a modern NVMe SSD, a traditional SATA SSD, or a mechanical hard drive. The operating system installer does not automatically search for or affect drives that you do not explicitly target.
If your secondary drive contains user folders that are actively synced to cloud storage (like OneDrive, Google Drive, or Dropbox), setting up those sync clients on the fresh OS can cause synchronization conflicts. In rare cases, improper syncing can overwrite newer files with older versions. Step-by-Step Guide to a Safe Clean Install Can I reinstall Windows 10 without losing my files
By doing this, it is physically impossible for the installer to touch, view, or accidentally wipe your secondary data. 3. Reconnect and Map Your Drives
Boot your computer using your installation media (such as a bootable USB drive). Advance through the initial language and keyboard options.
A clean install does automatically wipe all drives ; it typically only affects the specific drive or partition you select for the operating system installation. While it "cleans" the target location by removing existing system files and applications, other physical drives and separate partitions generally remain untouched unless you manually choose to format or delete them during the setup process. How Drives Are Affected
To perform a clean install of macOS, you typically boot into Recovery Mode, open Disk Utility, and erase the startup disk. The key step is ensuring you select the correct drive. In Disk Utility, you must first click View > Show All Devices, then select the topmost item—usually labeled "Apple... Media"—to erase the entire physical drive. If you only erase the volume (like Macintosh HD), you may not completely remove everything, but you will still only be erasing that specific volume.
Even though a clean install should only affect one drive, technical issues can occur if secondary drives are left connected: