Add a disk on my virtual machine Azure - powershell

Question

I am doing the this tutorial https://technet.microsoft.com/library/mt771177.aspx
The thing is I made my virtual machine and asign to the lun a 0.
The problem is I don t quite understand what does it mean to asign 0 to lun, and how does it affect that the following scrip to fail.
disk=Get-Disk | where {$_.PartitionStyle -eq "RAW"}
$diskNumber=$disk.Number
Initialize-Disk -Number $diskNumber
New-Partition -DiskNumber $diskNumber -UseMaximumSize -AssignDriveLetter
Format-Volume -DriveLetter F
disk=Get-Disk : The term 'disk=Get-Disk' is not recognized as the name of a cmdlet, function, script file, or operable
program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ disk=Get-Disk | where {$_.PartitionStyle -eq "RAW"}
+ ~~~~~~~~~~~~~
+ CategoryInfo : ObjectNotFound: (disk=Get-Disk:String) [], CommandNotFoundException
+ FullyQualifiedErrorId : CommandNotFoundException
Initialize-Disk : Cannot validate argument on parameter 'Number'. The argument is null. Provide a valid value for the
argument, and then try running the command again.
At line:3 char:25
+ Initialize-Disk -Number $diskNumber
+ ~~~~~~~~~~~
+ CategoryInfo : InvalidData: (:) [Initialize-Disk], ParameterBindingValidationException
+ FullyQualifiedErrorId : ParameterArgumentValidationError,Initialize-Disk
New-Partition : Cannot validate argument on parameter 'DiskNumber'. The argument is null. Provide a valid value for
the argument, and then try running the command again.
At line:4 char:27
+ New-Partition -DiskNumber $diskNumber -UseMaximumSize -AssignDriveLet ...
+ ~~~~~~~~~~~
+ CategoryInfo : InvalidData: (:) [New-Partition], ParameterBindingValidationException
+ FullyQualifiedErrorId : ParameterArgumentValidationError,New-Partition
Format-Volume : No MSFT_Volume objects found with property 'DriveLetter' equal to 'F'. Verify the value of the
property and retry.
At line:5 char:1
+ Format-Volume -DriveLetter F
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : ObjectNotFound: (F:Char) [Format-Volume], CimJobException
+ FullyQualifiedErrorId : CmdletizationQuery_NotFound_DriveLetter,Format-Volume

Answer 1

You're not setting the variable correctly.
Your code...
disk=Get-Disk | where {$_.PartitionStyle -eq "RAW"}
Needs to have a $ in front to make "disk" a variable
$disk = Get-Disk | where {$_.PartitionStyle -eq "RAW"}