currently I have 3 disks:

1. pm981 nvme samsung 512GB

2. WD SSD Blue 2 TB M.2 (WDS200T2B0B)

3. Seagate Spinpoint M9T 2TB 2.5-Inch SATA

I'v read manual

https://www.dell.com/support/manuals/us/en/04/precision-17-7720-laptop/prec7720_om_pub/storage?guid=guid-f2eddf77-c951-4697-9e34-98cfa739d70f&lang=en-us

But still not sure is it impossible install M.2 4TB... chipset will not recognize such disk? or there is some chance it will work fine? or... can I install M.2 2TB instead of pm981 nvme samsung 512GB?

(HDD 4TB can't install coz it is 15 mm height)