Save powershell get-disk as variable and the use it in if function

I want to make script run only from a specific usb drive. I want to make variable $drive which has output of get-disk command, and the, if $drive contains my usb serial – make some function.

$drive=get-disk -SerialNumber "980D06056030" | ft SerialNumber

if ( "980D06056030" -eq $drive ) {Write-Host "Yes"}

This doesn`t work =(

>Solution :

You should use SerialNumber property like this.

$drive = (get-disk -SerialNumber "980D06056030").SerialNumber
 if ( "980D06056030" -eq $drive ) {Write-Host "Yes"}