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Merge pull request #2662 from YongRhee-MSFT/docs-editor/schedule-antivirus-scans-1738769933
Update schedule-antivirus-scans.md -- Emm is reviewing
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defender-endpoint/schedule-antivirus-scans.md

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author: emmwalshh
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ms.author: ewalsh
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ms.custom: nextgen
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ms.date: 05/16/2024
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ms.date: 02/05/2025
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ms.reviewer: pauhijbr, ksarens, yongrhee, bsabetghadam
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manager: deniseb
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ms.subservice: ngp
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| Scan type | Description |
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|:---|:---|
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| Quick scan <br/>(*recommended*) | A quick scan looks at all the locations where there could be malware registered to start with the system, such as registry keys and known Windows startup folders. Quick scans also run on mounted removable devices, such as USB drives. <br/><br/>A quick scan helps provide strong protection against malware that starts with the system and kernel-level malware, together with [always-on real-time protection](configure-real-time-protection-microsoft-defender-antivirus.md), which reviews files when they're opened and closed, and whenever a user navigates to a folder.<br/><br/>In most cases, a quick scan is sufficient and is the recommended option for scheduled scans. Starting with the December 2023 (4.18.2311.x.x) release of [Platform Update](microsoft-defender-antivirus-updates.md), you have the option to scan all files and directories that are excluded from real-time protection using contextual exclusions are scanned during a quick scan.|
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| Full scan | A full scan starts by running a quick scan and then continues with a sequential file scan of all mounted fixed disks and removable/network drives (if the full scan is configured to do so).<br/><br/>A full scan can take a few hours or days to complete, depending on the amount and type of data that needs to be scanned.<br/><br/>When a full scan begins, it uses the security intelligence definitions installed at the time the scan starts. If new security intelligence updates are made available during the full scan, another full scan is required in order to scan for new threat detections contained in the latest update.<br/><br/>Because of the time and resources involved in a full scan, in general, we don't recommend scheduling full scans.|
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| Quick scan <br/>(*recommended*) | A quick scan looks at all the locations where there could be malware registered to start with the system, such as registry keys and known Windows startup folders. Quick scans also run on mounted removable devices, such as USB drives. <br/><br/>A quick scan helps provide strong protection against malware that starts with the system and kernel-level malware, together with [always-on real-time protection](configure-real-time-protection-microsoft-defender-antivirus.md), which reviews files when they're opened and closed, and whenever a user navigates to a folder.<br/><br/>Preview: In most cases, a quick scan is sufficient and is the recommended option for scheduled scans. Starting with the December 2023 (4.18.2311.x.x) release of [Platform Update](microsoft-defender-antivirus-updates.md), you have the option named "Quick scan include exclusions" to scan all files and directories that are excluded from real-time protection that is using contextual exclusions. By enabling this policy, the excluded files and folders are scanned during a quick scan. Note: While in preview, management is available in Intune - Settings Catalog.|
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| Full scan | A full scan begins with a quick scan and then scans all mounted fixed disks and removable/network drives (if the full scan is configured to do so).<br/><br/>A full scan can take a few hours or days to complete, depending on the amount and type of data that needs to be scanned.<br/><br/> The full scan uses the security intelligence definitions installed at the time the scan starts. If new updates are released during the full scan, another full scan is required in order to scan for new threat detections contained in the latest update.<br/><br/> Due to the time and resources involved, we generally don't recommend scheduling full scans.|
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| Custom scan | A custom scan runs on files and folders that you specify. For example, you can choose to scan a USB drive or a specific folder on your device's local drive.|
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