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Does the Windows Server 2012 Data Deduplication feature work with 3rd party defrag programs, in particular Auslogics Disk Defrag? I recently enabled the Data Deduplication feature on a drive to test it out and noticed that the drive is being reported in Auslogics as being 91% fragmented (YIKES!). I'm wondering if it's possible (and worthwhile) to defragment it in Auslogics without a high risk of data loss.

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I'm quite sure that you won't loose any data, the bigger question is whatever the data will remain deduplicated. Deduplication usually causes quite high fragmentation... – Hubert Kario Jan 6 '13 at 18:00
It will. Because on the file system level it is stored in separate files - one for the file, others for the fragments. Any sensible modern defrag FOR server 2012 should deal with it at least correctly. – TomTom Jan 6 '13 at 18:03
This question really should be "Do 3rd party defrag programs work with the Windows Server 2012 Data Deduplication feature?" – joeqwerty Jan 6 '13 at 19:06
@joeqwerty or "is defrag still important on a windows 2012 volume that's using the data deduplication feature" - maybe there's little point in running defrag if the volume is going to fragment easily due to the nature of the data dedup feature? – RobM Jan 6 '13 at 22:03

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