OS X: which volume is a DVD?

How can I programmatically determine which (if any) mounted volumes are a DVD?

I currently look for a directory with permissions 555 but I would prefer something a bit less hacky. Thanks!!

$ ls -l /Volumes/
total 12
dr-xr-xr-x  4 mh    gfx    136 Aug  3  2001 DQRMX2102
lrwxr-xr-x  1 root  admin    1 Apr  6 15:09 Macintosh HD -> /
drwxrwxr-x  9 mh    gfx    374 Feb  3 12:55 data

From stackoverflow

• What programming language/toolkit are you using?

  If you're using Cocoa in Objective-C, you can NSWorkspace:

  NSArray *volumes = [[NSWorkspace sharedWorkspace] mountedRemovableMedia];
  

  If you want to find out from the command line or a script or something, diskutil should come in handy.

  $ diskutil info -plist /Volumes/Foobar
  <?xml version="1.0" encoding="UTF-8"?>
  <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
  <plist version="1.0">
  <dict>
  ...snip...
      <key>OpticalMediaType</key>
      <string>CD-ROM</string>
  ...snip...
  </dict>
  </plist>
  

• For Cocoa, you can use NSWorkspace mountedRemovableMedia: to get a list of volumes and the use NSWorkspace getFileSystemInfo:... to get more information about each mounted volume.

  - (BOOL)getFileSystemInfoForPath:(NSString *)fullPath 
                       isRemovable:(BOOL *)removableFlag 
                        isWritable:(BOOL *)writableFlag 
                     isUnmountable:(BOOL *)unmountableFlag 
                       description:(NSString **)description 
                              type:(NSString **)fileSystemType
  

  If you want to make system calls, you can use statfs at the same information.

  int statfs(const char *path, struct statfs *buf);