Lost my SSD

Hi all, got a problem with my SSD drive.
Today I got a popup telling me that I need to restart my
computer because of an upgrade. Since today is Friday, I suspected that it
would be the upgrade to ver.1809 and not a normal Tuesday update. Turns out I was
correct.
So before I let windows upgrade, I wanted to make an image
of drive 0 with Macrium. At this time my second drive, divided into 3
partitions, was working fine. I set up Macrium to place the image on my drive 1
and after about 2 minutes it beeps at me and tells me it cannot write to it. No
big deal, I use my external drive and did the backup.
I then went into Disk management and found out that disk 1
is listed as unknown and not initialized.
I right click on it and select initialize disk. A popup tells me to
select the disk, it is already selected and MBR is selected and I press OK. Another
popup tells me “the system cannot find the file specified”
I have a backup off what was on that disk, so I am not
worried about losing anything, but how do I get my disk back?
Thanks

Just restart and see what happens. If the drive is still offline then check the power & data connections to your drives.

I did restart last night, twice, and nothing would change, but the power never was totally of. when i fired it up this morning, after reading your post, all is well. All data is there. Strange, don't know what happend there.
Thanks for your reply.
Sven