Reinstalled Windows 7, now 2nd hard drive dissapears

[kotter]

After I completely ruined the original Window's 7 that was on my laptop (had registry problems that lead to MBR corruption) I painfully gave up fixing and reinstalled the OS. I have 2 drives on my machine, primary for OS and secondary for media and backup files. First time around I did a "upgrade" trying not to loose apps, data, etc on the primary but that was a disaster with carrying over corrupted data. So I did a clean sweep on OS drive and completed a full reformat install from USB.
Primary drive is working fine, tested with Seagate tools, Disk manager, etc. Problem is, the secondary cannot be accessed and have been racking my brains for 3 and 1/2 days trying to figure this out. I have blasted though MANY forums in which people find they need to "assign" a drive letter in disk manager but my drive is not there. In bios it was there and now seems to be totally random to appear on restart. The best part, in another forum someone recommended the app "Belarc" which analyses your total configuration of hardware and software. (very cool tool btw) But guess what, my second hard drive is on the report!
I have booted into cmd, ran every test command to see "Disk 0" which shows in the Belarc app to no avail. Hoping someone in this forum might have the silver bullet or idea to get my second drive back without having to crack it open physically and taking the drive out, thanks in advance!

 

[kotter]

PS: also after the clean install checked to make sure BIOS is latest, all drivers / updates up to date, uninstalled then reinstalled devices to trouble shoot, defragged, cleaned up w/Ccleaner, ran Seagates disk checker which primary OS drive is healthy but doesn't detect 2nd drive, CHKDSK finds no errors, PSU is fine, checked security enabled in bios when it appears and a whole bunch of other stuff I am probably forgetting to mention.

 

[Ranger4]

Is it possible that you have installed Windows with MBR format, whereas you 2nd disc is in UEFI format.

 

[kotter]

Is it possible that you have installed Windows with MBR format, whereas you 2nd disc is in UEFI format.

Tried enabling UEFI in bios and rebooted to no avail....