[QUOTE=edgotham;2584717]i understand what it is after reading this…
but i still don’t know why a person would want to do it. can someone explain a little bit more?[/QUOTE]
It can be for several reasons.
Drive manufacturers produce different versions of the same drive for different purposes.
Companies that assemble PCs just want to buy in bare drives without the fancy packaging etc. and drive manufacturers often produce OEM versions of the drive for this purpose either as general OEM devices intended for use by all PC producers or sometimes even specific versions for very large companies.
New firmwares for OEM versions tend to take a bit longer filtering through as the drive manufacturers tend to give priority to the full retail version.
So you might want to cross flash your drive to obtain more recent or more frequent firmware updates.
Sometimes cross flashing can enable or add additional features to a drive or perhaps a certain firmware produces more reliable burns.
No doubt there are other reasons too but these are probably the most common ones.