WD Elements 1 TB after formatting to exFat on MacOS works very slowly

Good day. My WD Elements 1 TB after formatting to exFat on MacOS Macbook Air works very slowly on writing/erasing. I did mistake deleting reserved system space on HDD, now it’s fully free but my WD programs for Mac doesn’t recognise it. How i can return or renew WD information on HDD that it will start to work very quick as before and would be seen by WD programs. Thank you.

In addition I can say that external SMART check programs do not recognise it also. How I can fix problem with slow speed recording. Example : Writing time of 1.45 Gb file is up to 6 days! Thanks for replies!