radamsiii;
I can't tell how this relates to some of your more recent posts (some duplicates). Please describe the exact configuration--eg what OS on what drive?
What do you mean by "reformat"? If, for example, you format a partition with a filesystem, you aren't going to get an error message about the bootloader failing to install.
Reading your other posts, I see that you were putting Linux on an external USB drive. This can be fragile: Depending on what is plugged into the system, the system will see the drive numbering differently. When the Linux bootloader is on the internal drive, there are situations where it cannot find its files on the external.
If you are dual-booting, I recommend putting both OSes on the internal drive, and using the external for shared data, backup, etc.
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