Hi [NAME] thank you for sharing request for additional information.  The Seagate FireCuda 530 link goes to the 4TB Seagate FireCuda 530 M.2 2280-D2 PCIe Gen 4.0 NVMe interface (backwards compatible with PCIe Gen 3.0 interface). The 4TB and 2TB M.2 2280‑D2 FireCuda SSD have parts on both sides and a height (thickness) of 3.5 mm, click on Data Sheet.  Install new SSD in the other M.2 2280 slot. (My earlier "Alienware 15 R3 with Base cover removed" image shows the M.2 2280 boot drive installed in the SSD-3 slot, so SSD-2 would be the other M.2 2280 slot.) When Alienware logo splash screen appears, hold down the F2 key to enter BIOS menu. Look in BIOS Main menu towards the bottom drive list to confirm that the new SSD has been correctly installed. Then allow system to boot into the Windows operating system and open Disk Management. 5 Ways to Open Disk Management on Windows 10 or 11 (howtogeek.com). When Disk Management opens, a pop-up will appear and prompt you to right click, and initialize the new 4TB SSD. Select the GUID Partition Table (GPT), assign drive letter, and click OK. GPT is used on modern systems and shall be used for more than 2TB capacity storage devices. Clone (copy) contents of boot drive across to the new 4TB SSD. How to Initialize Your SSD for Windows | Crucial.com.  On a new Alienware 15 R3 the M.2 2280 SSD will be installed with a thin copper Thermal Shield, Dell P/N JV98R, example: Amazon.com: Deal4GO 2280 M.2 SSD Heatsink Hard Drive Cover 03N3W3 JV98R for Dell G5 5587 G7 7588 Alienware 15 R2 R3 R4 17 R2 R3 R4 R5.  
Hi there I still work with the initial 256GB SSD in my Alienware 15 R3, but it comes to an end in terms of space and I would like to upgrade to 1TB. Now I have the following questions I hope someone here can answer: Thanks in advance and regards TiRohn
15 R3, upgrade my SSD