Why is my WD My Passport Ultra become unusable a lot
My WD 4tb Ultra drive is not working as expected. Suddenly it became undetected because the RAW error/Unmounted. I did format the drive and checked it for bad sectors and it passed the long check with no errors. before formatting I was able to recover all my 3.6 TB files with no problem at all using a data recovery software.
After formatting i used it again to transfer 300 GB files it became unusable again in the middle of the transfer. I was able again to retrieve all transferred data from the drive. This happened again after formatting and while transferring data.
The recovery software is able to recover and browse all data with 0 errors. so what is the problem and how i can fix it if possible.
OS: MacOS Mojave 10.14.4
The drive file system is HFS+