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[Solved] Stacker, dedup, Windows 10

PostPosted: Mon Jun 01, 2015 11:44 pm
by casial

I was thrilled to find an application that relies not only on compression algorithms but employs deduplication as well and support win10 at the same time, for the structure of some of ma data partitions make huge gains from dedup and little to none from transparent compression... but in another post I found out the deduplication is the one by MS from WinServer - the one I use on my W8.1 computers and the one I'm not able to use on my W10 preview builds, because Win10Server and client builds are not updated in sync, thus new client build is prone to break working deduplication imported from server builds and hacked into the client version - with nasty side-effect of cutting you out from your data on deduped partition. Moreover you stated you have no means of legally getting the needed disms to your software, so I'd be on my own with getting them - what would make Stacker into little more than GUI frontend for the MS Dedup backend - correct me please should my assumptions be wrong here - but until both client and server final versions of Win10 are released or unless MS implements dedup into the former (or ZFS gets native support for WIn:), ZIPmagic, viz. Stacker, isn't going to help me with getting dedup to work on W10, is it?

Thanks for any info on this subject.


Re: Stacker, dedup, Windows 10

PostPosted: Tue Jun 02, 2015 11:13 am
by admin
No, unfortunately not - your understanding here is 100% correct.

Dedup is not available for your boot partition. Dedup is available only on 64 bit Windows and the Server line.

Together with these limitations, ZIPmagic cannot redistribute dedup components from the Server line for the Workstation line.

Of course, some third parties have already shared these components for the existing Windows 8 and Windows 8.1 lines: ... windows-8/ ... ndows-8-1/

It is reasonable to expect that when Windows Server 10 becomes available, third parties would again share the relevant components.

However, the 64 limitation and the inability to process the boot partition will remain on Windows 10, regardless of this availability.

Because of all these limitations, ZIPmagic is focusing on DriveSpace and DoubleSpace as preferred transparent disk compression tools.

We were actually developing some boot disk compression technology last year based on dedup, before the general availability of WIMBoot technology (used by DoubleSpace).

Dedup compresses substantially better than WIMBoot, so this line of research may be reopened at a future date.

However, dedup is unsuitable for live data and bleeds space extremely fast - making constant recompression a necessity, even much worse than how fast WIMBoot bleeds space: ... ion.65995/

So even though ZIPmagic had internally solved the challenge of applying dedup to a boot volume last year, major challenges still remain.

I understand the decision was to reopen this line of investigation in the future, if and when Microsoft adds official client OS support for dedup.

A good reason for you to pressure them to do so :)

Re: Stacker, dedup, Windows 10

PostPosted: Tue Dec 01, 2015 3:38 pm
by admin
Great news! We finally have working data deduplication for Windows 10, both the original 10240 build: ... plication/

And the updated 1511 (Threshold 2) build: ... -en-US-x64

ZIPmagic Stacker works perfectly fine with either build, once you have installed data deduplication services.