Free disk partition editor: https://www.hdd-tool.com/partition-manager/partition-editor-free.html
If installing new disk, try to obtain vendor-specific software (Samsung, SeaGate, Toshiba) and use their partition tools.
Windows boot disk
You may need to user BCDboot tool to ensure any new disks are bootable - see https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/bcdboot-command-line-options-techref-di?view=windows-11
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