Difference between VHD and VHDx disk

Difference between VHD and VHDx disk

• The .vhd format has been used with Microsoft virtualization products since the days of Virtual Server. 
• The .vhdx format is new to Windows Server 2012.
• VHD:Virtual hard disk files in .vhd format are limited to 2040 GB. Virtual hard disks in this format are supported on Hyper-V hosts running Windows Server 2008, Windows Server 2008 R2, Windows Server 2012 and Windows Server 2012 R2.
• Other than the size limitation, the important thing to remember is that you cannot use virtual hard disk files in .vhd format with generation 2 VMs.
• VHDx: Virtual hard disks in .vhdx format have the following benefits:
• Can be up to 64 TB in size,Have larger block size for dynamic and differential disks,Provide 4-KB logical sector virtual disks,Have an internal log that reduces chance of corruption,Support trim to reclaim unused space
• The main limitation of virtual hard disks in .vhdx format is that they cannot be used with Hyper-V on Windows Server 2008 or Windows Server 2008 R2.