How do I get to open Local Disk D?

[Microsoft Windows]

Hello. I'm struggling to open Local Disc D. I had it appear on my screen, however it cannot be opened or used. I tried restarting the device, but unfortunately that only made the Local Disk D completely disappear from my screen. I have many apps and files on it... Therefore, it is needed, and I cannot format it. How can I open it or get my device to see it? I use Thin GF63 12VE.

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