Yes, you may install a drive up to 4 TB. You may see compatible drives from Crucial, though you don't have to buy Crucial. Dell's maximum memory and storage specifications are published at the time of system design, based on what they tested. They are not limitations, so don't take them as gospel. Technology evolves, and often larger RAM sticks and larger drives become available after Dell publishes the specs, and Dell does not generally go back to revise the maximum specs. So, Dell's specs should not be interpreted as limitations or maximums. Whenever touching components or working inside a computer, wear a grounded wrist strap, also called anti-static wrist strap, ESD wrist strap, or ground bracelet. It's a cheap and sensible precaution. Rest the laptop on an anti-static mat or at least a reasonable alternative such as corrugated cardboard.
Hi to everyone, I have a 2017 precision 5520, I currently have my laptop with a 512gb ssd drive, I am thinking of upgrading to a higher capacity ssd drive, my question is up to how much capacity does the Motherboard  support, according to the manual it is 1tb, is this correct? Or has added more capacity, as an addition, having a 6 cell battery, I cannot add HDD since there is no space. Thanks in advance. regards
Precision 5520 - Storage Upgrade