Small app/script that will warn if an (external) drive is not connected

@echo off

set DriveLetter=H:
set FlagFile=%TEMP%\DriveNotConnected.flag

if not exist %DriveLetter%\ (
    if not exist %FlagFile% (
        msg * "Drive %DriveLetter% not connected!"
        echo. > %FlagFile%
    )
) else (
    del %FlagFile% 2>nul
)

while($true){
while (Test-Path -Path H:\) {sleep 2}
Add-Type -AssemblyName System.Speech; (New-Object System.Speech.Synthesis.SpeechSynthesizer).Speak('Drive disconnected, please plug the drive back in.')
sleep 2
}

@(gwmi Win32_PnPEntity | ?{ $_.DeviceID -match '^USBSTOR' } | %{
    $DeviceID = $_.DeviceID
    [PSCustomObject]@{
        Drive = gwmi Win32_DiskDrive | ?{ $_.PNPDeviceID -eq $DeviceID } | %{ Get-WmiObject -Query "ASSOCIATORS OF {Win32_DiskDrive.DeviceID=`"$($_.DeviceID.replace('\','\\'))`"} WHERE AssocClass = Win32_DiskDriveToDiskPartition" } `
            | %{ Get-WmiObject -Query "ASSOCIATORS OF {Win32_DiskPartition.DeviceID=`"$($_.DeviceID)`"} WHERE AssocClass = Win32_LogicalDiskToPartition"} | %{$_.DeviceID}
        Model = $_.Name
        DeviceID = $DeviceID
    }
}) | Sort-Object Drive

Drive Model                             DeviceID                                                              
----- -----                             --------                                                              
D:    Corsair Voyager USB Device        USBSTOR\DISK&VEN_CORSAIR&PROD_VOYAGER&REV_0.00\444444444444444Q&4     
E:    Seagate Expansion Desk USB Device USBSTOR\DISK&VEN_SEAGATE&PROD_EXPANSION_DESK&REV_9401\UU1UUU11&1      
F:    Seagate Portable USB Device       USBSTOR\DISK&VEN_SEAGATE&PROD_PORTABLE&REV_0712\FF00FFFF&0            
G:    Seagate Backup+  Desk USB Device  USBSTOR\DISK&VEN_SEAGATE&PROD_BACKUP+__DESK&REV_0406\QQ4QQ444&4       
R:    Seagate Backup+ Hub BK USB Device USBSTOR\DISK&VEN_SEAGATE&PROD_BACKUP+_HUB_BK&REV_D781\RR3RR33R&3      
S:    Seagate Expansion Desk USB Device USBSTOR\DISK&VEN_SEAGATE&PROD_EXPANSION_DESK&REV_0915\GGGGGGGG&0      
T:    Seagate Expansion HDD USB Device  USBSTOR\DISK&VEN_SEAGATE&PROD_EXPANSION_HDD&REV_0003\66666666QQQ6Q6Q6&6

# https://stackoverflow.com/questions/54482594/powershell-wmi-trigger-action-when-specific-device-is-plugged-in

# Use '%' for wildcard
$DeviceID = 'USBSTOR%CORSAIR%VOYAGER%'

Unregister-Event -SourceIdentifier USBDisconnected -ErrorAction Ignore

# Event when disconnected (InstanceDeletionEvent)
$Disconnect_Action = {
    msg * Corsair Voyager has been unplugged.
}

$query = "Select * FROM __InstanceDeletionEvent WITHIN 1 WHERE TargetInstance ISA 'Win32_PNPEntity' and TargetInstance.DeviceID like '$DeviceID'"
Register-WMIEvent -Query $query -Action $Disconnect_Action -SourceIdentifier USBDisconnected

powershell -nop -ep bypass -f USB_Disconnect.ps1

Set objShell = CreateObject("WScript.Shell")
objShell.Run "cmd /c C:\Admin\Backup\Drive_Check\Drive_Check.bat", 0
Set objShell = Nothing

@echo off

set DriveLetter=H:
set FlagFile=C:\Admin\Backup\Drive_Check\DriveNotConnectedDoNotWarnAgain.flag
set "nircmdPath=C:\Admin\Backup\Drive_Check\nircmd.exe"

if not exist %DriveLetter%\ (
    if not exist %FlagFile% (
        start "Drive Checker" "%nircmdPath%" infobox "Please connect flash drive! :-)" "Drive Checker" 0 0
        echo. > %FlagFile%
    )
) else (
    if exist %FlagFile% (
        del %FlagFile%
    )
)

Set objShell = CreateObject("WScript.Shell")
objShell.Run "cmd /c C:\Admin\Backup\Drive_Check\FlagFileRemover.bat", 0
Set objShell = Nothing

@echo off

set FlagFile=C:\Admin\Backup\Drive_Check\DriveNotConnectedDoNotWarnAgain.flag

if exist %FlagFile% (
    del %FlagFile% >nul 2>&1
)

Get-WmiObject Win32_DiskDrive | ?{ $_.PNPDeviceID -eq $DeviceID } | %{ Get-WmiObject -Query "ASSOCIATORS OF {Win32_DiskDrive.DeviceID=`"$($_.DeviceID.replace('\','\\'))`"} WHERE AssocClass = Win32_DiskDriveToDiskPartition" } `
            | %{ Get-WmiObject -Query "ASSOCIATORS OF {Win32_DiskPartition.DeviceID=`"$($_.DeviceID)`"} WHERE AssocClass = Win32_LogicalDiskToPartition"} | %{$_.DeviceID}

Get-CimInstance -ClassName 'Win32_DiskDrive' -Namespace 'root\cimv2' -Filter 'InterfaceType = ''USB''' |
ForEach-Object {
    $diskDrive = $_
    [PSCustomObject]@{
        Drive = [string](@(Get-CimAssociatedInstance -ResultClassName 'Win32_DiskPartition' -InputObject $diskDrive |
                Get-CimAssociatedInstance -ResultClassName 'Win32_LogicalDisk' |
                Sort-Object -Property 'DeviceID' | Select-Object -ExpandProperty 'DeviceID') -join ', ')
        Model = [string]$_.Model
        DeviceID = [string]$_.PNPDeviceID
    }
} | Format-Table -AutoSize

powershell

$DriveLetter = "H:"
$FlagFile = "C:\Admin\Backup\Drive_Check\DriveNotConnectedDoNotWarnAgain.flag"
$nircmdPath = "C:\Admin\Backup\Drive_Check\nircmd.exe"

if (!(Test-Path $DriveLetter)) {
    if (!(Test-Path $FlagFile)) {
        Start-Process -FilePath $nircmdPath -ArgumentList "infobox 'Please connect flash drive! :-)' 'Drive Checker' 0 0" -WindowStyle Hidden
        New-Item -Path $FlagFile -ItemType File | Out-Null
    }
} else {
    if (Test-Path $FlagFile) {
        Remove-Item $FlagFile -Force
    }
}

powershell

$FlagFile = "C:\Admin\Backup\Drive_Check\DriveNotConnectedDoNotWarnAgain.flag"

if (Test-Path $FlagFile) {
    Remove-Item $FlagFile -Force
}

Powershell -Window Minimized -c ""

Powershell -Window Normal -c ""