Hello Nick,  1.  Yes, adding the new drive as GPT, else you won't get 14TB 2.  Convert your C:\ drive to GPT is not required to add large storage drive but I suggest to convert your C:\ drive so you can use UEFI boot mode.  Win 10 has built-in tool to convert MBR2GPT.  There are different ways, you can run from inside and outside Windows as well.  Just run command to validate full OS and convert.
Hello community,   I have a Dell T3600 workstation that I brought brand new few years back.  I now need to expand my hard drive space.  I want to install 14TB Sata hard drive as secondary drive.  I can't seem to find if my machine would support a large hard drive as secondary. Before I go ahead and purchase the drive, anyone know if this is possible? thanks community  Best Regards, NP
T3600 Workstation does it support secondary 14TB Sata drive?