YACoder

I suggest you review all of your drive's connectors in ESXi... especially the RDM to your VM. From what I remember reading, if you gave a controller to one particular VM, it may generate some unexpected results. This goes beyond your current Win7 VM but all the other ones that you have...

Try changing the LSI SAS to vmware's built in one... or even SATA... Doesn't the Controller association gives the VM complete control over that specific controller?

Robbie, I am just curious, if you were to carve out some space for a new VM running, let's say Ubuntu, what would Ubuntu see? For some strange reasons, I have a feeling it is the OS. If vSphere is reporting it as 7.xTB, if RDM was done properly, it should be visible. However, if the OS never understood anything above a certain size in the HDD.... maybe that's where the issue is. When you say VMWare 6.5, I am assuming ESXi 6.5, correct? Also, here is a thread I found that have similar symptoms to what you are seeing... http://www.tomshardware.com/answers/id-3037971/seagate-8tb-hdd-shows-1307-91gb-win7-2tb-bios.html The op also saw 1.33TB from a 8TB Seagate.... One of the answers was, switch channels.