http://valinet6l6tq6d5yohaa6gdsf2ho4qcqcxyj2nahp5kd4z7nsa6ycdqd.onion/2015/09/22/ThinkPad-W540-review.html
So now, I keep my OS on the 256 GB SSD, and my data on the 7,200rpm factory provided 500 GB HDD, which is a Seagate model BTW. To recap, the machine has a solid offering in this department: 2 SATA3 slots, and 2 M.2 slots (which if you want to use both for storage, you’ll have to do without WiFi and Bluetooth).