Partition Sizes
19.10.11 David Segura
I don't recommend changing the Partition sizes from the defaults, as I consider them 'Perfect'. The only real difference between MBR and GPT is the MSR Partition for UEFI GPT layout
SYSTEM - 260MB | GPT MSR 16MB | WINDOWS - REMAINDER | RECOVERY - 990MB
And when I say 'Perfect', this layout mirroring between MBR and GPR allows you to convert from MBR to GPR without moving around any partition data

SizeSystemMbr
#System Partition size for BIOS MBR based Computers
#Default = 260MB
#Range = 100MB - 3000MB (3GB)
#Alias = SSM, Mbr, SystemM
[Alias('SSM','Mbr','SystemM')]
[ValidateRange(100MB,3000MB)]
[uint64]$SizeSystemMbr = 260MB
SizeSystemGpt
#System Partition size for UEFI GPT based Computers
#Default = 260MB
#Range = 100MB - 3000MB (3GB)
#Alias = SSG, Efi, SystemG
[Alias('SSG','Efi','SystemG')]
[ValidateRange(100MB,3000MB)]
[uint64]$SizeSystemGpt = 260MB
SizeMSR
#MSR Partition size
#Default = 16MB
#Range = 16MB - 128MB
#Alias = MSR
[Alias('MSR')]
[ValidateRange(16MB,128MB)]
[uint64]$SizeMSR = 16MB
SizeRecovery
#Size of the Recovery Partition
#Default = 990MB
#Range = 350MB - 80000MB (80GB)
#Alias = SR, Recovery
[Alias('SR','Recovery')]
[ValidateRange(350MB,80000MB)]
[uint64]$SizeRecovery = 990MB
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