Standard_LRS
The PowerShell cmdlet that you are looking for is Set-AzVMOSDFisk
The 4 options for StorageAccountType are; Premium_LRS, Standard_LRS , StandardSSD_LRS and UltraSSD_LRS
$vm = Set-AzVMOSDisk -VM $vm -ManagedDiskId $osDisk.Id -StorageAccountType Standard_LRS -DiskSizeInGB 128 -CreateOption Attach -Windows
You'd use it in VM Creation like this;
$vmName = "myVM" $vmConfig = New-AzVMConfig -VMName $vmName -VMSize "Standard_A2"
$vm = Add-AzVMNetworkInterface -VM $vmConfig -Id $nic.Id
$vm = Set-AzVMOSDisk -VM $vm -ManagedDiskId $osDisk.Id -StorageAccountType Standard_LRS -DiskSizeInGB 128 -CreateOption Attach -Windows
New-AzVM -ResourceGroupName $destinationResourceGroup -Location $location -VM $vm
For more information, see https://learn.microsoft.com/en-us/azure/virtual-machines/attach-os-disk?tabs=powershell and https://learn.microsoft.com/en-us/powershell/module/az.compute/set-azvmosdisk?view=azps-9.7.1