Using Array in Invoke-Command on Remote Machine

I'm trying to run a script that will test if various network drives are mounted to several systems (i.e. \\path\to\share mounts as T:). These are all stored in a CSV file, and each drive letter is separated by a space. I can import each row into a variable and loop through them, but I can't seem to pass them into an Invoke-Command script block.

I've spent some time googling the issue and did find a few suggestions, but I still seem to be having issues getting everything to work. Code is as follows:

$credentials = Get-Credential
$sysdrives = Import-Csv .\systems.csv
$i = 0

while ($i -lt $sysdrives.length) {
    $drives = $sysdrives[$i].Drives.split(" ")
    $currsystem = $sysdrives[$i].System

    Write-Host "Testing $currsystem..."
    foreach($drive in $drives) {
        Invoke-Command -ComputerName $currsystem -Credential $credentials -ScriptBlock {
            $currdrive = $Using:drive
            Write-Host "Testing if $currdrive is present..."
            if (!(Test-Path $currdrive)) {
                Write-Host "$currdrive not present!"
            }
            else {
                Write-Host "$currdrive is mounted"
            }
        } -ArgumentList $drive
    }
    $i += 1
}

Example entry from my CSV file:

fqdn.server.name,X: Y: Z:

EDIT: In case someone else stumbles across this post, this is how I was able to solve it:

1. I was missing a param() block underneath inside the Invoke-Command ScriptBlock
2. I replaced Test-Path with Get-PSDrive. This allowed me to test the drives successfully, despite not being logged into the machine. Your mileage may vary in your own environment, but it worked just fine for me.

I made a few other modifications to clean up the output a bit, but here's the code I'm using:

$credentials = Get-Credential
$sysdrives = Import-Csv .\systems.csv
$i = 0

while ($i -lt $sysdrives.length) {
    $drives = $sysdrives[$i].Drives.split(" ")
    $currsystem = $sysdrives[$i].System

    Write-Host "Testing $currsystem..."
    foreach($drive in $drives) {
        Invoke-Command -ComputerName $currsystem -Credential $credentials -ScriptBlock {
            param($currdrive)
            Write-Verbose "Testing if $currdrive is present..."
            if (!(Get-PSDrive $currdrive -ErrorAction SilentlyContinue)) {
                Write-Host "ERROR: $currdrive is not mounted!!!" -BackgroundColor Black -ForegroundColor Red
            }
            else {
                Write-Verbose "$currdrive is mounted"
            }
        } -ArgumentList $drive
    }
    $i += 1
}