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Choose Virus and threat protection and go to Scan options.Now click Updates and Security and navigate to Windows Security.Click the Windows icon and choose Settings.

Launch Windows built-in antivirus program or any other antivirus software to check your system for viruses. The blue screen of death error “QUOTA_UNDERFLOW” 0x00000021 can be caused due to a virus infection on your system. Once the automatic restarting of Windows is disabled, you can try implementing these steps to fix the QUOTA UNDERFLOW blue screen error:

Then uncheck the box beside ‘ Automatically restart’ under the system failure section.

Click Settings under Startup and Recovery section.

Now click Advanced system settings and go to the Advanced tab.

Press Windows + X keys together and click System to launch it.

Follow these steps to stop Windows from automatic restart: This is why before trying to fix the error, you need to disable the automatic restart option in Windows 10/11.

Viruses attacks may block system files.īSOD QUOTA_UNDERFLOW error can shut down your Windows repeatedly once it begins visibly.Damaged or deleted Windows registry, or you have accidentally deleted system keys.Device drivers installed in your system are outdated or incompatible.An incompatible version of BIOS is installed.Your system doesn’t have enough free space on the hard disk.What Causes QUOTA_UNDERFLOW Error?īlue Screen of Death QUOTA_UNDERFLOW error can be caused due to a variety of reasons, and some of them are: BSOD QUOTA_UNDERFLOW error has error code 0x00000021. This error can slow your system or make your hard drive unmountable. The QUOTA_UNDERFLOW error occurs due to the mismanagement of the disk quota. The usage quota controls the usable disk space, while the file quota sets what number of files and directories can be created. There are two basic disk quotas – Usage quota or Block quota and File quota (or inode data). What is QUOTA_UNDERFLOW?Ī disk quota is a value generally assigned by the system administrator who controls a limited part of the file system on operating systems. Let’s look at the QUOTA_UNDERFLOW error and learn how to fix this issue. For example, one such error is the QUOTA_UNDERFLOW error, which usually occurs when the system administrator mismanages the disk quota. This error is accompanied by a description of the problem and the error code. How to Recover Lost Files Using Stellar Data Recovery Software?īlue Screen of Death (BSOD) is the fatal system error that can cause your system to stop, freeze, or crash.