Unable to validate and add new harddisk

Hi,

I am unable to validate and add new harddisk from below script. I want to validate, if the value is greater than 0 then add the hardisk else skip this step.

$vmlist = Import-CSV ".\vmdeploy1.csv" -UseCulture

foreach ($item in $vmlist) {

#Grabbing the vm object once for efficiency.

$VM = Get-VM $item.vmname

#Add Harddisk

if($item.ahdd -gt 0){

$VM | New-HardDisk -CapacityGB $item.ahdd -Confirm:$false

}

else

{

Get-VM $vm | Start-VM -Confirm:$false

}

}

There is no error and harddisk.is not getting added.

Please help