Yes, I was actually! Nobody replied here a year ago, so I took my chances and bought the Ultrastar He10 8TB 3.5-inch Helium Platform Enterprise Hard Drive anyway off Amazon and mounted it in my desktop system and it works perfectly. I’m close to maxing it out with media, so will purchase a NAS with two of the same drives here soon and will leave the original 8TB in my desktop system. Never experienced any data loss or any other issues so far (knock on wood). It was a little “clicky” at first but don’t really notice it anymore.
I have an older HP desktop from 2012 so not sure why your system isn’t seeing the drives? I can’t say I ever had issue with BIOS detecting the drive. Perhaps make sure the BIOS is up-to-date? Did you try different SATA cables? Different ports on the motherboard? Try disconnecting any SATA optical drives and use that port temporarily to see if it sees the drive. Not sure if SATA ports can be disabled in BIOS, so also check for that? Perhaps check your power supply to see if there aren’t any issues there. Exceeding voltage quota, etc.
When I installed my drive, I did do a complete hard drive overhaul. Swapped out the original primary drive for a Samsung 250GB Solid State Drive, set the Ultrastar He10 8TB as a backup internal data drive, moved the original Hitachi 2TB HDD that came with the system as internal scratch drive and then did a clean reinstall of Window7. I experienced really slow boot times at first, but things seemed to resolve after I reformatted the original 2TB drive inside Win7 after boot. Go figure. Not sure what that was all about but it did have me scratching my head for a while. Guess it didn’t like the partition table. I was really surprised that Win7 SP1 saw the entire 8TB drive by default because I had read that it would only detect 2TB at first and you had to tweak something.
Interested to see how things turn out for you!