Usually, you’ve got the option to access C drive files directly through File Explorer.
Hard drive shows up in BIOS but not Windows?
Why does this issue occur?
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How to resolve it?
Get answers from this post.
How to Fix if the C Drive Is Not Visible
Solution 1.

Unhide C Drive
Step 1.
Press theWindows + Rkey combination, then typegpedit.mscin the input box and pressEnter.
Navigate toUser Configuration>Administrative Templates>Windows Components>File Explorer.

In the right panel, double-clickHide these specified drives in My Computer.
In the new window, choose the option ofNot ConfiguredorDisabled.
Finally, clickApply>OK.
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Then you might find out if the C drive is displayed in Windows Explorer.
Alternatively, you canunhide the partition by using CMDor third-party disk management tools likeMiniTool Partition Wizard.
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Solution 2.
In this case, you gotta add a drive letter to the system drive.
First, right-click theStartbutton and chooseDisk Management.
Second, right-click theC drive, then chooseChange Drive Letter and Paths.
Third, hitAdd, then choose the letterCfrom the drive letter list and clickOK.
Solution 3.
It helps check the disk status and repair potential errors.
In the Windows search box, typeCommand Prompt, then right-hit it and chooseRun as administrator.
Next, typechkdsk C: /fin the command line window and pressEnter.
Once the CHKDSK command is executed, errors on the C drive should be resolved.
Are you looking for CHKDSK alternatives for disk error checking?
Here this post introduces several powerful tools.
Solution 4.
It may be because of a missing drive letter, a hidden disk, or software conflicts.
Hope you’ve got the option to get this issue resolved after trying the methods listed above.