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While GParted is primarily a partition editor, it includes a built-in "Information" panel that acts as a real-time calculator. When you resize a partition, it shows you the exact start and end sectors. hard disk partition calculator download free
: The go-to open-source option. It's incredibly powerful but usually runs from a bootable USB, making it a "pro" choice for managing disks outside the OS. Check it out at GParted.org . Based on the research and analysis presented in