Depuplication problems.

I have a 3.5TB drive that has 500GB of data on it but is full. The dedup folder properties shows 3.0TB.
Why is this and is there a way to get my space back without formatting the drive.
The files that are being deduplicated are Veeam backup files.
pgcITAsked:
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gheistCommented:
And The Deduplication provider is?
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pgcITAuthor Commented:
This is on Server2012
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gheistCommented:
Where is vmware?
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pgcITAuthor Commented:
What's the relevance of this question?
Server 2012 is running deduplication on a drive that is storing Veeam backups.
Veeam Backup & Replication is software for VMware VMs backup.
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gheistCommented:
Sorry but you are too brief.
You still have not told if your windows is physical machine or virtual machine and how you found that disk is full (is it vmware disk or physical disk?)
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compdigit44Commented:
I will assume you are using dedup through Veeam if so what are your storage optimization options set to. Also what type of 3.5TB drive are using using?

http://helpcenter.veeam.com/backup/70/vsphere/compression_deduplication.html
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pgcITAuthor Commented:
@ compdigit44 Thanks for the link.
A bit more information. The server 2012 is a physical server and the drive that I had a problem with is a physical attached three disk RAID5 array of 2 TB disks each...so roughly 3.5TBs. What is being stored on that physical disk are Veeam backups. Probably not ideal to have Windows deduplicate Veeam backup files but it wasn't our intention in the first place.
Since then we aggressively moved a large portion of the Veeam backup folders from the drive. Only 250GBs of space was recovered from the move but over the next few days we now have another 2.5TB recovered.
Dedup Voodoo I guess.
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gheistCommented:
3.5TB means that it will take more than two days per windows deduplication pass.
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pgcITAuthor Commented:
Every Saturday a "garbage collection" is done, releasing data back to the OS.
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gheistCommented:
You can run another pass during the week...
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pgcITAuthor Commented:
Data was recovered after Saturday
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