Theoretically more info is needed. What tool was used to format HDD? What content is on HDD (e.g. games, HDDOSD 2.0...). What tool was used to add games... All I can add is that currently I'm on FHDB 1.966 from 13\04\2019 connected through genuine NA and everything seems to work quite fine. My console do not have modchip. I've also checked my PS2 HDD with HDD checker v0.964 from 13\04\2019... It takes some time to initialize (~10 sec) when I want to check for errors, but everything seems to be also well. BTW It doesn't mean that everything is working in my config, it cannot be any errors on other consoles... Sometimes more test need to be made.