Как добавить в массив строк новый элемент?

CLS
$my30414 = @()
$DriveList = Get-WmiObject Win32_logicaldisk -filter "DriveType = '2'"
If ($DriveList -eq $NULL) 
{ 
    write-host "No flash drives"
    break 
}  
Else
{    
#if just 1 flash drive found 
    If ($DriveList[-1] -eq $NULL)
    {
        $myFiles = @(get-childitem -Path $DriveList.DeviceID -Filter *.txt | Where {!$_.PSIsContainer})
        If ($myFiles -ne $NULL)
        {
            $i = 0
            ForEach ($myFile in $myFIles)
            {
                $myPath = Join-Path -Path $DriveList.DeviceId -ChildPath $myFile
                                                
                $myRaw = Select-String -Path $myPath -Pattern "30414"
                $my30414 += $myRaw.SubString($myRaw.IndexOf("=")+1, 20)
 
                $i += 1                
            }
        }        
    }
#if more than 1 flash drive found   
    Else
    {}
    write-host "end_Of_script"  
    write-host $my30414
 
    $i=0
    ForEach ($oneAc in $my30414)
    { 
    $i += 1
    write-host "Counter value", $i
    write-host $oneAc 
    }
    write-host "End ", $i
}

$my30414 = (Select-String -Pattern '^3041' C:\Temp\numbers.txt).Line
$my30414

$my30414 = (ls C:\Temp\numbers*.txt | Select-String -Pattern '=3041' -Encoding default).Line
$my30414

cls
$my30414 = $null
If ($DriveList = Get-WmiObject Win32_logicaldisk -filter "DriveType = '2'") 
{    
    foreach ($drive in $DriveList)
    {
        $my30414 += (ls -Path $drive.DeviceID -Filter *.txt -File | Select-String -Pattern "=30414" -Encoding default).Line
    }
    
    $my30414
    Write-Host "Найдено:" $my30414.Count "строчек"
}
else
{ 
    write-host "No flash drives"
    break 
}