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Windows Server 2012 Hyper-V Cookbook by Leandro Carvalho

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Converting VHD files to VHDX files

Microsoft has been using the same Virtual Hard Disk (VHD) format since the one created by Connectix in 1995. That was created to allow Windows 3.1 to run on Mac computers. It has been improved, but as with any other product's lifecycle, its life ended. On Windows Server 2012, the default format is VHDX and provides lots of features and enhancements compared to its previous version.

It has been designed to work well with all the new modern storage options and has capabilities to provide reliability and store large scenarios. VHDX now supports 64 TB against 2 TB of VHD. Also, it supports larger logical sector sizes up to 4 KB, and large block sizes up to 256 MB, to optimize the virtual disk performance.

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