object.IsReady 

function ShowDriveInfo(drvpath)
{
   var fso, d, s, t;
   fso = new ActiveXObject("Scripting.FileSystemObject")
   d = fso.GetDrive(drvpath)
   switch (d.DriveType)
   {
      case 0: t = "Unknown"; break;
      case 1: t = "Removable"; break;
      case 2: t = "Fixed"; break;
      case 3: t = "Network"; break;
      case 4: t = "CD-ROM"; break;
      case 5: t = "RAM Disk"; break;
   }
   s = "Drive " + d.DriveLetter + ": - " + t;
   if (d.IsReady)
      s += "<br>" + "Drive is Ready.";
   else
      s += "<br>" + "Drive is not Ready.";
   return(s);
}

Function ShowDriveInfo(drvpath)
   Dim fso, d, s, t
   Set fso = CreateObject("Scripting.FileSystemObject")
   Set d = fso.GetDrive(drvpath)
   Select Case d.DriveType
      Case 0: t = "Unknown"
      Case 1: t = "Removable"
      Case 2: t = "Fixed"
      Case 3: t = "Network"
      Case 4: t = "CD-ROM"
      Case 5: t = "RAM Disk"
   End Select
   s = "Drive " & d.DriveLetter & ": - " & t
   If d.IsReady Then 
      s = s & "<BR>" & "Drive is Ready."
   Else
      s = s & "<BR>" & "Drive is not Ready."
   End If
   ShowDriveInfo = s
End Function