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It doesn't - unless you've set a schedule. The 'default' is Wednesday mornings at 1am - which is pointless because the computer cannot defrag the drive while it's switched off ! You would normally set the defrag program to run at a specific time and day which suits your needs. You can set it to run daily, weekly or monthly at whatever time is suitable to you.

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11y ago
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7y ago

Normally it doesn't defrag itself. So you will need to do it yourself if you want it to. to do that you will need to go to search bar and type defrag or disk defragmenter to be precise. Then you can change settings to be schedule so it automatically do it daily, weekly or month, or you can just do it manually every time.

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Q: How often does Windows 7 automatically defragment a hard drive?
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