Here's a link to an older version of PartedMagic. It's a distro oriented towards system rescue. Download it(1.7gb), write it to usb, then boot to it. Read about here, or buy a more updated version...
https://partedmagic.com/
https://mega.nz/file/wVFAyQKI#GFUHDrQbd1DnRHvkqwxqFId9UT3b0kaS8PC1z_QKYYU