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I'm trying to enable Data Deduplication on C: drive but Server Manager doesn't allow me to do so. After using PowerShell command it gave me following message:

Windows PowerShell
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PS C:\Windows\system32> Import-Module Deduplication
PS C:\Windows\system32> Enable-DedupVolume C: -UsageType Default
Enable-DedupVolume : MSFT_DedupVolume.Volume='C:' - HRESULT 0x8056530b, The 
specified volume type is not supported. Deduplication is supported on fixed, write-enabled NTFS data volumes and CSV backed by NTFS data volumes.
At line:1 char:1
+ Enable-DedupVolume C: -UsageType Default
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: 
    (MSFT_DedupVolume:ROOT/Microsoft/...SFT_DedupVolume) [Enable-DedupVolume], CimException
    + FullyQualifiedErrorId : HRESULT 0x8056530b,Enable-DedupVolume

PS C:\Windows\system32>

However this Volume indeed is NTFS, write enabled, fixed Volume. At least I guess so, that's what Server Manager says.

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  • If you've confirmed that your volume meets all the requirements (we can't tell you if they do, based on what you've provided), then you probably have a corrupted volume. Back up data from it, destroy it, recreate it, restore data, and then try enabling deduplication again. Apr 21, 2017 at 16:33

1 Answer 1

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Data deduplication is not supported on boot or system drives:

Deduplication was built for NTFS data volumes and it does not support boot or system drives

Introduction to Data Deduplication in Windows Server 2012

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