SSD M.2 comparability with E7440

The E7740 does not have an M.2 slot so the answer is no. You have a slot for the WWAN card which could support an mSATA SSD but if you have a WWAN card you would have to remove it for the SSD. And of course you could replace the HDD with a 2.5" SATA SSD. More information on the mSATA drive in this forum post.

The answer above is correct. Note that even among laptops that do have M.2 slots, some of them only support M.2 SATA drives, not M.2 NVMe drives like the Samsung unit you’re asking about. Looking at newer generations of the 14” Latitude 7000 Series, the 7480 and above support M.2 NVMe SSDs, for what it’s worth. I’m not sure about the E7470, which is the model between the E7440 and 7480. (Not sure why Dell didn’t use the numbers between 40 and 70.) But the 7480 also dropped the E-Port docking station connector that exists on the E7440 and E7470, which is why the 7480 and newer models no longer have an “E” in their names.

Hi just seen this post regarding your comments on the WWAN slot. Here's some info  bought a 2016 Lattitude E5250 a few months ago. Noticing the WWAN was a mini PCIe slot. Did a search to . Isee if any SSD's would work as a 2nd back up drive. Found a YT vid "Dell Latitude 5401 - install second SSD into WWAN slot" He made the point to use the M.2 NVMe PCIe type card. So looked on the bay and found a cheap £10 TOSHIBA 128GB M.2 2230 PCIe NVMe SSD Just to try out. My WWAN should have the 2242 SSD card. Although too small to screw down. I was able to make the card stable, using some masking tape and sticky pads. The SSD was recognised from start up, no messing with bios. After usual setting up for any new HD, It worked perfect. Still working perfect today. Speeds of the New drive has settled down to: Read = 850MBs Write =600MBs