Quote - If your disk keeps disappearing then you have a more fundemental problem which needs to be resolved quickly before your system becomes corrupted and won't boot.  My suggestion is you go back to the person who did the upgrade, explain to them what is happening and ask for it to be fixed. 

Also make sure any files that are important to you are backed up onto an external drive or USB stick.

 

I would agree with the above.  I had a similar problem with an earlier computer in that is would 'lose' a hard drive and it turned out to be a faulty SATA cable.  In most cases if SSDs fail they fail completely, but that does not mean that is not the fault just that there are other possibilites.  If someone else did the upgrade go back to them.  If you installed the SSD yourself, try using a different cable or SATA prot on the motherboard to diagnose the fault.  If the SSD is still playing up I would return it.  That said the first thing you should do is back up your data.

I have a system similar to yours and I am running Poser 2014 and I have not seen the problem you describe even with Reality 3 and Poser running at the same time so, based upon that, I would say it looks like your computer not Poser.

 

 

 

 

I use Poser 13 on Windows 11 - For Scene set up I use a Geekcom A5 -  Ryzen 9 5900HX, with 64 gig ram and 3 TB  storage, mini PC with final rendering done on normal sized desktop using an AMD Ryzen Threadipper 1950X CPU, Corsair Hydro H100i CPU cooler, 3XS EVGA GTX 1080i SC with 11g Ram, 4 X 16gig Corsair DDR4 Ram and a Corsair RM 100 PSU .   The desktop is in a remote location with rendering done via Queue Manager which gives me a clearer desktop and quieter computer room.