Chosen Solution

My SSD-drive just stopped working - and is most of the time not visible in the BIOS-SATA conf. How can I replace it? Update (08/09/2019) The G551JX has 2 harddrives. The 1 TB HD shown in the video, but I am having trouble replacing the 128 GB SSD in the laptop. I have dismounted the HDD as show above, and ran a utility, that shows me there is still the 128 GB SSD left, so it is not a hybrid disk

Here’s how to replace the hard drive: Asus ROG GL551J Hard Drive Replacement

Found this https://superuser.com/questions/1092009/