I had a drive start to make some terrible noises so I figured I would use it as an opportunity to get 2 new 18 TBs in my system and replace my 16TB  parity drive.  Bought 2 on amazon, I'm limited on space in my server so I put one in to preclear, no problem.  Once it finished, took it out and put the second one in and it makes terrible sounds and never shows up in unraid.  Exchange it for a replacement drive, that one doesn't make any terrible noises, but never shows up in unraid.  I plug in the first 18TB drive and it shows up just fine so I try again and nothing.  Return that drive and buy another one from Best Buy because, why not, and same exact issue.  I'm using the exact same power and data connection that the first 18TB shows up on but I've gone through 3 other ones and none of them are appearing.  Even though these are not shucked drives, I've tried the 3.3 volt trick with a molex adapter and also using tape but they never show up.  I find it hard to believe I got 3 bad drives in a row but maybe I'm just that unlucky.

Attaching diagnostics in case anyone sees something I'm missing.  In this diag, both drives are plugged in.

Thanks in advance!

tower-diagnostics-20230512-1010.zip

Check the board BIOS, if it's not detected there it also won't be detected by Unriad, and if you are using the same cables it would suggest a bad drive.

Thanks for the response.  I figured if I'm using the exact same cables with another 18TB seagate drive and it shows up, then it must be a bad drive.  Just can't figure out how I got 3 in a row.  ordered another one so we'll see if it continues.