This has been confusing users for years. Dell only lists SSD as compatible which they have actually tested but is in no means the maximum compatible. You can go all the way up to 4TB. For example Crucial here lists up to and including 4TB as compatible.
Hi i have a Dell G5 SE 5505 laptop. I thought of upgrading my storage. But in the user manual (online) it shows that it can support only 1TB of storage and there are 2 slots. I thought of buying 2 2TB SSD. Will it support till 4Tb of storage. Or only maximize 1TB per slot. 
SSD Upgrade