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When you say it's not showing up, is it not in device manàger?The only issue I now have is that the PC is only seeing my main SSD drive. The second SSD drive is not showing up.
If it is then it just needs initialising
Initialize new disks
Learn how to initialize new disks with Disk Management and get them ready to use. Also access links for troubleshooting.
learn.microsoft.com
You'd want GPT
If it's not showing in disk manager then try removing it and reinstalling. If it's still failing to be read then it's likely a failed drive