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Hi, I am having a problem with my 2nd hdd, I have an SSD and a 750gb HDD in the optical drive that I use as storage. I have my main folder redirected in my hdd , it used to worked just fine but the last week, I boot on MacOs and a window appeared saying that there was an error formating the HDD, I can read and copy the files on the HDD but I can´t write nothing on it. I have formatted the HDD and it starts to work fone again, but after 5 days the same problem occurs. I have checked the drive and it seems to just work right. I hope you can help me. The HDD is an original Apple HDD 750gb

The drive may have developed bad blocks. To map them out, reformat the drive and use the “write zeros” option. This will tell the directory where those blocks are and it won’t try to write to them.