cd drive - Win32_LogicalDisk Access Property Always Unknown in PowerShell -

i'm using simple script check status of cd/dvd drives on machine. want able tell if drive writable. have following test code:

$script_obj = new-object -comobject wscript.shell $drives = @(get-wmiobject win32_logicaldisk -filter 'drivetype=5') $script_obj.popup($drives[0].deviceid + " " + $drives[0].access) 

this show drive letter of cd/dvd drive on machine, access parameter comes 0 (unknown) though have writable cd inserted drive. have tried formatting cd used same usb device (as opposed music cd) can open browse file structure (there no files), doesn't change anything.

isn't access property supposed give me 2 or 3 or 4 instead of 0?

edit:

i tried inserting playable dvd , cd. dvd doesn't read, cd works though. able burn cd , play on normal cd player. throughout process ran command given jan below , got same output every time:

ps c:\users\ian> get-wmiobject win32_cdromdrive | select caption, drive, mediatype, access  caption                                                          drive                                                            mediatype                                                        access                                                           -------                                                          -----                                                            ---------                                                        ------                                                           hp cddvdw sh-216al                                               d:                                                               dvd writer                                                                     

it doesn't matter whether or not inserted drive d, or type of disk is, output. i'm suspicious drive busted since wouldn't read video dvd, dunno. refurbished desktop. there more reliable ways check writeable cd using ps?

access field in cd/dvd drive blank, if there no media in drive. once insert disk drive, can read mediatype, access fields , lots of other info.

to find capabilities of cd/dvd can use win32_cdromdrive mediatype property.

ps > get-wmiobject win32_cdromdrive | select caption, drive, mediatype  caption                                          drive                                            mediatype                                        -------                                          -----                                            ---------                                        hp dvd  dh16ablh                               g:                                               dvd writer 

reference - checking if cd/dvd drive writer or cd-rom using wmi