thank you for replying
my post is aimed to understand if there are known motherboard or sata controller issues with this NUC model.
the HDD's I've mentioned are internals so they obviously working at 5V. external HDD are not relevant for my post.
as I mentioned before I have encounterd this issue with 2 NUC's carrying the Western Digital HDD, while other NUC's were working fine with the same HDD model.
this NUC's factory installed bios version is 0021, I have upgraded one of them to the latest version 0033 which did not affect the issue.