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.
Step 1Rescapp searches for hard drives on your computer.
Step 2If such hard drives have been found, Rescapp displays a list of the hard drives. At the same time you are prompted:
Which hard drive do you wish to recompute its hybrid MBR CHS on?
You are supposed to choose, the hard disk which, has a GPT partition for which, you want its hybrid MBR CHS to be recomputed.
Step 3Rescapp with all the gathered information, is going to recompute the CHS, for the hybrid MBR on your GPT hard drive.
Step 4You are informed about the hybrid mbr CHS recompute process.You either get:
[SUCCESS] The hybrid MBR CHS was recomputed OK! :)
or
[ERROR] The hybrid MBR was not recomputed. Something went wrong! :(