You're not done yet, however, and you still need to finish setting up your newly-initialized SSD. Once the initialization process has finished running, it will open up a new window titled ‘New Simple ...

If Disk Management Tool displays Disk 1, Unknown Not Initialized then it means that Windows 11/10 can’t the initialize the disk. Here is how you can fix the issue.

To fix the SSD not showing up issue, run CHKDSK, configure BIOS settings, initialize the SSD drive, or format it by disk management.