Hello my friends. I have an acer predator helios 300 (ph315-51) with a
m.2 hfs128g39tnd-n210a SSD and a 2.5 inch toshiba mq04abf100 HDD drive.
Now, I noticed 1 second stutters throughout my windows (opening folders
and programs) that happen apparently randomly, especially noticeable in
some games (the stutters happen in some games, not in others). I found
out that the stutters occur in proximity of a 100% usage HDD spikes,
like the ones in the screenshots.
I tried everything: fresh windows install, latest drivers, safe mode, disabling all non essential software, intel RST installed and uninstalled, link state power management disabled and enabled, even unplugged and replugged the HDD ...nothing, the spikes are still here (I didn't try updating bios though, I have the 1.19 version, I don't know anything about bios updating nor I can find a newer version for my laptop, that's why I didn't try it yet)
What could be the issue? Is it solvable?
It's strange because it sometimes happens even when opening folders or
zip files (that's what I was doing in the screeshots), that are stored
on my D partition on the HDD or programs that are ALL installed C: (which is on the SSD). At first I thought maybe the in game stutters occur because the HDD is only 5400rpm, but then I noticed the problem even when doing simple and really light stuff, like opening an almost empty folder...It's driving me crazy, so I'm open to all
suggestions how to discover what's the issue and how to solve it! Thanks in
advance 
(sorry for any english mistake, for the grammar nazis
)