Windows Blue Screen of Death Error 0x00000021 – QUOTA_UNDERFLOW

In this post, you’ll learn about the Blue Screen of Death (BSOD) or Stop Error 0x00000021-QUOTA_UNDERFLOW and the reason why you are receiving the error message in Windows 10 or Windows 11

How does this BSOD Error Message in Windows Looks like

0x00000021 – QUOTA_UNDERFLOW

Why do you receive the Error 0x00000021 QUOTA_UNDERFLOW in Windows?

This BSOD means that quota charges have been mishandled by returning more quota to a particular block than was previously charged. BSOD error code 0x00000021 may also show “QUOTA_UNDERFLOW” on the same blue screen.

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