transition problem

[AfroSamurai]

I have windows installed on one ssd in legacy mode, 2 other ssd's and 2 other hdd's are installed as storage for programs and files.

This week i want to upgrade to an NVME ssd drive and i want to clean install a system on it in UEFI mode which shouldn't be a problem.

My question is when i boot in UEFI mode on the new nvme drive, will i see my storage drives, my data on them and so on?

[AfroSamurai]

In other words when i'm in windows on GPT partition in UEFI mode. Will i see MBR partitions on old drives connected to the PC.