If your drive has old partitions or the wrong file system, follow these steps to reset it completely.
You don't need to boot into Windows to use Diskpart. You can trigger it directly from the installation media. Boot your PC using a Windows 10 USB or DVD. diskpart windows 10 install
On the "Install Now" screen (or where you select your language), press . A black Command Prompt window will open. Type diskpart and press Enter . Step-by-Step: Preparing a Disk for Installation If your drive has old partitions or the
Type clean .⚠️ Warning: This deletes every file and partition on the selected disk. Boot your PC using a Windows 10 USB or DVD
If clean fails, try typing attributes disk clear readonly while the disk is selected. This removes software-level locks preventing the installation. Best Practices for a Clean Install
Return to the installation window, click "Refresh," and select the newly cleaned space to continue. Troubleshooting Common Errors
If you see an error saying the disk is of the GPT partition style but your BIOS is set to Legacy (or vice versa), Diskpart is the only way to fix it without third-party software. Use the convert gpt or convert mbr commands after the clean step to match your BIOS settings.