Create a virtual HDD on hyper-v 2012 Core

hi guys
i tried to create a Virtual HDD on Hyper-2012R2 Core however it won't allow me to !
new-vhd : Failed to create the virtual hard disk.
The size specified for 'D:\Virtual Machines\Movies.vhdx' is too small. The smallest valid size for a virtual hard disk is 3MB.
A parameter that is not valid was passed to the operation.
+ CategoryInfo : InvalidArgument: (Microsoft.Hyper...l.VMStorageTask:VMStorageTask) [New-VHD], VirtualizationOperationFailedException
+ FullyQualifiedErrorId : InvalidParameter,Microsoft.Vhd.PowerShell.NewVhdCommand
any suggestions ?

Since we're talking about 2012R2, I'm not a fan of the syntax after checking technet. Let's rework the order a bit and try this command:
New-VHD -Path D:\Virtual Machines\Movies.vhdx -SizeBytes 800GB -Dynamic
http://technet.microsoft.com/en-us/library/hh848503.aspx
Thank you for your answer however it comes back with the next error.
[hv1]: PS D:\> New-VHD -Path D:\Virtual Machines\Movies.vhdx -SizeBytes 800GB -Dynamic
A positional parameter cannot be found that accepts argument 'Machines\Movies.vhdx'.
+ CategoryInfo : InvalidArgument: (:) [New-VHD], ParameterBindingException
+ FullyQualifiedErrorId : PositionalParameterNotFound,Microsoft.Vhd.PowerShell.NewVhdCommand

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