@Fernando,
I create this thread for W10 x64 boot media on SAMSUNG 950 PRO NVMe SSD user's.
Samsung NVMe driver v1.4.7.17 is used.
SMART indication reports a non nul value of 'unsafe shutdown' counter for this device:


I ignore why this '319' value for this counter, but if i compare to i750 SSD NVMe counter this one is nul:


The reason I observe this counter is to try to explain why I get on W10 x64 booting off 950 PRO an abnormal number of Windows 'unexpected shutdown' such as:



Is it a Samsung NVMe driver issue ?
Is it a 950 PRO controller firmware issue ?
Is it a W10 driver parameters issue somewhere ?
Is there any other reason ?

Booting off W10 from i750 NVMe I have never got any W10 'unexpected shutdown' reliability message reported.

@Fernando,
Thanks for your analysis.

I understand that on your side the system (W10x64) SSD 950 PRO S.M.A.R.T. ' unsafe shutdown ' counter value is absolutely = ZERO ?
And on your side is it true whatever the machine (and BIOS) the 950 PRO is plugged in ?

I have to check and observe carefully on 2 different systems I have (Z77 and X99) using each one a 950 PRO this ' unsafe shutdown ' parameter value evolution...

It is very strange that Magician v4.7 never warms on this parameter value ... which seems specific to NVMe devices.
I ignore the exact reason and signification of this smart parameter not described in the public 950 PRO documentations.

I share with you the idea the "cold start" problem is a potential BIOS issue.
On my side I observe that "shutdown" i750 (OS system) takes sometimes several tens of second up to 5 minutes ('round circle').
A contrario shutdown 950 PRO (OS system) takes never more 1 or 2 seconds on X99 and about 4 seconds on Z77 !

Do you have observed on your side a similar (strange) thing about shutdown time difference (i750 vs 950 system) ?
If shutdowning is very very short why not initialization problem detected for the next repowering, and why not 'unsafe shutdown' logged in SMART value parameter ?

@Fernando,
Thanks for the correct Samsung 950 PRO proper naming. I have fixed it in this thread.
You can get the Samsung 950 Pro S.M.A.R.T. values using diffrent tools such as HWINFO64, SIVx64, Magician, Speccy, etc..
I have tested SSD-Z tool but had some troubles with whatever the SSD used and the platform used and so abandonned this tool.
Here is Magician screen:


I note you get also 'unsafe shutdowns' non zero value with SM951 NVMe !
Please, can you have a look on your Samsung 950 PRO and on your i750 what are the values ?

@Fernando,

On my side I use Intel SSD Tool and Samsung Magician Tool on the same W10 x64 system because my platform X99 has the both SSD Manufacturers up and running (see my signature).

I observe for i750 , 1523 hours powered on, 'unsafe shutdowns' = ZERO.
I observe for 950 PRO, 817 hours powered on, 'unsafe shutdowns' = 319.
I observe Intel SSD tools v3.3.6 does not display the 'unsafe shutdowns' "0D" parameter, however Magician v4.7 does.

I report the HWinfo64 screens:

and DiskInfo screens:


If somebody can explain why does 'unsafe shutdowns' specific to NVMe devices does represent, it may be helpful.

(Nota: On my SM951 SSD AHCI device the 'unsafe shutdowns' parameter does not exist)

@Fernando,
Here is the description of what the 'unsafe shutdowns' counts for SSD NVMe devices.
This information is extracted from Intel SSD Tool Help, however current Intel SSD Tool v3.3.6 does not display this count.

Hello guys, thought I would share what I see as well. Here too, Samsung 950 Pro 512GB. I am using HD Sentinel and mine shows something similar. I work from home so I know if my system would have had one. On 6-8-2016 starts the climb to where it is today. I checked my logs and I cannot find any activity of driver updates or Microsoft updates in or around 6-8. I wish I can go back in time to see when the first 8 appeared. I do know I installed the Samsung NVMe driver on 3-9-2016 per my records and I built this system on 12-5-2015 using the older driver version till March. Looking at HD Sentinel then that means I had 8 unsafe shutdowns even with the older driver.

Using Asus Maximus VIII Hero

Anyways just sharing what I am seeing thanks to both of you bringing this up.

@Fernando,

I have uninstalled now Magician on all my PCs and will observe if 'unsafe shutdowns' becomes stabilized or not.

On my side it is very very rare I got a BSOD and have to stop the PC, so I don't explain why I have 319 'unsafe shutdowns' events.

I observe that on 2 different PC's with a Samsung 950 PRO installed I see logged in Window Reliability panel abnormal (randomly) 'Unexpected Windows shutdown' critical errors (may be 3 or 5 times per day).

The question is:
Does Samsung 950 PRO 'unsafe shutdowns' events and W10 'Unexpected Windows shutdown' error are correlate or not ?

I observe on my PC booting off i750 I have never got any W10 'Unexpected Windows shutdown' critical error (1530 Power On Hours) !
No 'unsafe shutdowns' and No 'Unexpected Windows shutdown'.

On my side, I bet for a Samsung NVMe driver malfunction.

I was looking at my HD Sentinel report again and something strange. That error date 6-28-2016, I woke up today and started the computer and it has never shut off. I have been working on the system this whole time (3 hours before I saw this post). I know for sure no shutdown occurred

I checked another system with the same 950, it too shows 7, but there is no spike like mine today. Just a straight line and that one did not record a spike today when I turned that on. (Checked again after 2 hours and still at 7)

I also checked both systems in the Windows reliability and no entries. I am pegged on 10 in the graph so I am not having your issue 100PIER nor Fernando's with the pause at boot up. Maybe if the reading gets worst it will for my systems. Only time will tell.

@100PIER - I think I am going to do what you are doing; uninstalling Samsung's Magician and just go with what HD Sentinel will report going forward. I'll try to update later on with my numbers too