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Recompute CHS on a hybrid MBR on a GPT partition - Rescapp - Documentation

TIP: You probably do not need to use this option in 2020.

This option can sometimes help if a disk utility, OS, or BIOS doesn't like the CHS values used by the partitions on the protective or hybrid MBR. In particular, the GPT specification requires a CHS value of 0xFFFFFF for over-8GiB partitions, but this value is technically illegal by the usual standards. Some BIOSes hang if they encounter this value. This option will recompute a more normal CHS value -- 0xFEFFFF for over-8GiB partitions, enabling these BIOSes to boot.