I bought a Asus ROG GL552 and I had major issues trying to install a working SSD into the single m2 slot there.
Note, the GL552 and GL752 series (these are NOT the same as the higher end ROG G7552's!) don't support NVMe drives.
You have to have a SATA III m2 drive.
The ACHI m2 SSD versions don't work on this model (at least for some people, I see reports on this forum).
I bought a Samsung 850 PRO 512 SATA III m2 drive and installed that into the m2 drive on the GL552.
It detected this drive just fine. So at least on CANADIAN or AMERICAN versions of the GL552, Sata III m2 seems to be the working m2, not ACHI or NVMe.
However, using the Samsung Migration software to clone the 1 Terabyte default HDD OS installation to the new SSD did clone to the drive, but the drive would not boot a working version of windows 10. When I tried to boot from the new 512 850 EVO m2 SATA III on the GL552, it would boot into windows, but the desktop would flicker every half second and I could not click on anything.
I tried using Partion Magic, EaseUS TO Backup, Samsung Migration -- and every time I could NOT boot to windows properly on the new m2 SSD drive on the GL552.
Finally, I was able to get it working properly by using Macrum Reflect FREE, cloning from the HDD to the 512 Samsung EVO Sata III m2 SSD, switching the boot load order to the new SSD, and walla, it worked perfectly.
SO USE Macrum Reflect to Clone from your HDD to your SSD if you have the GL552 and you bought a Samsung 850 m2 SATA 3 SSD and you want to boot your OS from the SSD. The OTHER clone software did NOT produce a working installtion from me.
Today or tomorrow I'm doing this to a GL752VW bought in ASUS Europe. It's probably not the same motherboard than the 552 version, but I'll give it a try. Not sure if it's the USA/CAN version, or another different. Anyhow, there's no way to tell. Bought the same SSD Samsung EVO 850 256GB SATA III M.2. On the online manual of my version says NO sata is supported on the M.2 bay, but even ASUS can't tell the real specifications at the moment. We'll see, I will report results on this topic.
Little questioning before proceeding;
Should I disconnect the original HDD when first booting from SSD?
If not; How should I order the booting order? Now, I have first the Windows Boot Manager (WBM) or something like that, followed by the HDD, and in third place, the CDROM bay. I assume that if I leave connected the HDD, there'd be two WBM, so would be messy to place an order.
Don't have a clue either when it comes to the following doubt; If now, without connecting the SSD, I change the boot order and get the HDDin first place, followed by the WBM and CDROM... Would windows boot normally? What'd be the difference between placing the HDD loaded with windows in first OR second place?
Edit: tried that last question while waiting to the delivery van with the SSD and showed me a screen saying something like "please reboot and choose the correct boot option". So probably I will have to unplug the HDD when I want to boot the SSD for the first time. Don't know, anyhow, what is it gonna happen when both SSD and HDD are plugged. Maybe the both windows boot manager show the specific disk which'll try to load
I have the same laptop and thought I'd chime in.
1. Before I did anything I downloaded EASUS Todo Backup (free) and cloned the C and D drive onto a 64gb flash memory drive.
2. I then installed the M.2 850 Evo in to the laptop. Make sure you have a M2 3mm screw on hand to pin down the SDD as it doesn't come with it.
3. Go into Disk Management and initialise the SDD.
4. Run EASEUS Todo and and clone the C and D drive on to the SDD.
5. Turn off the laptop and remove the original 1TB drive
6. Restart the laptop and the laptop will be smart enough to boot from the SDD
7. Once logged into windows make sure everything is running okay. Once confirmed, turn off the laptop and reinstall the original HD.
8. Turn on laptop, log into windows and you'll see the original HD will now be assigned a new letter, as opposed to C and D.
How dumb of me.....I bought a 250 gig ssd and not realizing that the source C drive is larger than that! Duh....now I'm stuck.
I didn't remove the original HD when I booted from the SSD for the first time. Once I had cloned the HD to the SSD I changed the boot order in the BIOS to boot from the SSD before the HD. That way if it had any issues booting from the SSD I had the HD to fall back on. Once the laptop booted, I went into disk management to check to see that the partition on the SSD was labeled as the boot drive. My laptop now boots in about 10 seconds!