Problems with 1tb hdd syncronization

I bought an external HDD WD Elements Basic Portable Storage 1 T and i mistakenly used it with an old Mac Book Pro from 2009. BtW on the box of my hdd is writen that it’s compatible with both Mac and PC so i mistakenly used the Time Machine of my Apple notebook to transfer some data to my HDD but after that i can’t syncronize it anymore with both of my PCs l. I wanna ask somebody if would be possible to reset my HDD to its favtory settings and if i can how to do that cuz there isn’t any reset buton on it.

Thanks for the support !