# Kopia keeps re-scanning HDDs 24/7 which were completely unchanged

**URL:** <https://kopia.discourse.group/t/kopia-keeps-re-scanning-hdds-24-7-which-were-completely-unchanged/2756>\
**Category:** Support\
**Created:** [March 23, 2024, 4:31am UTC](https://kopia.discourse.group/t/kopia-keeps-re-scanning-hdds-24-7-which-were-completely-unchanged/2756 "2024-03-23T04:31:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![VcSaJen](https://yyz2.discourse-cdn.com/free1/user_avatar/kopia.discourse.group/vcsajen/32/997_2.png) [@VcSaJen](https://kopia.discourse.group/u/VcSaJen)\
**Post date:** [March 23, 2024, 4:31am UTC](https://kopia.discourse.group/t/kopia-keeps-re-scanning-hdds-24-7-which-were-completely-unchanged/2756/1 "2024-03-23T04:31:00Z")

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So I setup Kopia to backup my drives. Several non-system drives. I’m already worried that Kopia significantly reduced their lifespan by continuing needlessly re-scanning them over and over. Can Kopia just use system hooks or at least “Modify Date” metadata in file tables, instead of doing complete re-scans?

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**Author:** ![kapitainsky](https://yyz2.discourse-cdn.com/free1/user_avatar/kopia.discourse.group/kapitainsky/32/535_2.png) [@kapitainsky](https://kopia.discourse.group/u/kapitainsky)\
**Post date:** [March 23, 2024, 11:20am UTC](https://kopia.discourse.group/t/kopia-keeps-re-scanning-hdds-24-7-which-were-completely-unchanged/2756/2 "2024-03-23T11:20:43Z")

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And what makes you believe that kopia is doing complete re-scan?

Note that in case of mechanical disk even metadata only scan (which should be what kopia does for subsequent snapshots) can take long time especially if you have a lot of files, disk is heavily fragmented maybe using ExFAT filesystem etc. Every file mtime has to be checked. If you have 1 million files it means 1 million read operations.