PC Desktop will not recognized my 2nd HD

It's time to explore data recovery software.

Partitioning the first drive is well known to make other drives vanish. I can't know your expertise level so here's common titles used by many users of many skill levels.

GETDATABACK
Zero Assumption Recovery.

Yes, there may be a way to use disk management but you've been there so I'll not go back there.
Bob

PS. This is another fine example where partitions and even other drives do not make for backup. I'm sure you read somewhere that your data would be safe if you put it on a second drive or partition. That's a myth.

Your mistake was not renaming the D drive before you partitioned the main drive. You should have renamed it to Drive Z. Have you explored all the new partitions to see if it's among D, E.....etc? Did you look at Computer Management to see if it shows up there with a different name like G or unnamed? Did you limit your drive recognition with a utility like TweakUI? Your optical cd-dvd drive will also now have a different letter designation and will cause other problems. Have you checked for that? With today's huge hard drives, partitioning is really not necessary and causes more trouble than it's worth. It makes it hard to find anything.

Did you look in Device Manager under "hard disks" and/or in Computer Manager in the Control Panel under Administrative Tools/disk manager? I've seen Windows Explorer incorrectly show Zip drives and even CD ROM drives that were actually hard drive partitions if that drive letter was previously occupied by such device.

check ur masterslab set up in BIOS Setup is ur hard disk r set to primary & secondary.
Partitioning the C drive dont name it D.
ok