Diskutil and SDK APIs give conflicting disk-status information

Question

I have a new USB CDROM device. When I run "diskutil info /dev/disk1s2", it shows the device status information properly, including Ejectable status Yes. Please see the details below. But when I tried to retrive the "ejectable" status programatically using Mac OS X functions - "[NSWorkspace sharedWorkspace] getFileSystemInfoForPath",  "FSGetVolumeParms(info.volume, &params, sizeof(params)" or  "DADiskCopyDescription( disk )", I always get ejectable status NO or FALSE. I have some old USB CDROM devices - in this case, diskutil and Mac OS X functions show same results. What can it be? I tested it on many Mac OSs, everywhere it shows the same problem.
Thanks!
my-mac:Desktop sreekanthgeorge$ diskutil info /dev/disk1s2
   Device Identifier:        disk1s2
   Device Node:              /dev/disk1s2
   Part of Whole:            disk1
   File System Personality:       HFS+
   Type (Bundle):                      hfs
   Name (User Visible):                Mac OS Extended
   Owners:                   Disabled
   Partition Type:           Apple_HFS
   OS Can Be Installed:      No
   Media Type:              
   Protocol:                 USB
   SMART Status:             Not Supported
   Volume UUID:              BA5E769E-3CE0-33BA-9963-EBD55A11A176
   Total Size:               68.3 MB (68302848 Bytes) (exactly 133404 512-Byte-Blocks)
   Volume Free Space:        0 B (0 Bytes) (exactly 0 512-Byte-Blocks)
   Device Block Size:        2048 Bytes
   Read-Only Media:          Yes
   Read-Only Volume:         Yes
  Ejectable:                Yes
   Whole:                    No
   Internal:                 No
   Optical Drive Type:       CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-R, DVD-RW, DVD+R, DVD+R DL, DVD+RW
   Optical Media Type:       DVD-ROM
   Optical Media Erasable:   No

Answer 1

Thanks for your reply.
If you are talking about diskutil, diskutil always returns the same results for /dev (device) and /Volumes/xxxx (mounted) path. Please see my code snippet below, all code look good and all Mac OS X function calls succeeded with proper results. But when I check the device/volume status, it always give "not-ejectable", "not-unmountable" and "not-removable". Read-only status is always NO (thats correct).
Thanks again!
Method 1 with "[NSWorkspace sharedWorkspace] getFileSystemInfoForPath"
    NSString *path = @"/Volumes/xxxx";
    BOOL isRemovable = NO;
    BOOL isUnmountable = NO;
    BOOL isWritable  = NO;
    BOOL ret =[[NSWorkspace sharedWorkspace] getFileSystemInfoForPath:path isRemovable:&isRemovable isWritable:&isWritable isUnmountable:&isUnmountable description:nil type:nil];
    if ( ret )
        std::cout << "Removable " << (int)isRemovable  << "\n";
        std::cout << "Writable " << (int)isWritable << "\n";
        std::cout << "Unmountable " << (int)isUnmountable << "\n";
    else
        std::cout << "Failed" << "\n";
Method 2 with "FSGetVolumeParms"
    CFStringRef mobiKEYVolumeName = CFStringCreateWithCString(kCFAllocatorDefault, "xxxx", kCFStringEncodingUTF8);
    OSStatus result = noErr;
    for (ItemCount volumeIndex = 1; result == noErr; ++volumeIndex)
        HFSUniStr255    volumeName;
        FSVolumeInfo    volumeInfo;
        FSRef           ref;
        bzero((void *) &volumeInfo, sizeof(volumeInfo));
        result = FSGetVolumeInfo(kFSInvalidVolumeRefNum, volumeIndex, &actualVolume, kFSVolInfoFSInfo, &volumeInfo, &volumeName, &ref);
        if (result == noErr)
            CFStringRef name = CFStringCreateWithCharacters(kCFAllocatorDefault, volumeName.unicode, volumeName.length);
            if (name != NULL && (CFStringCompare(name, mobiKEYVolumeName, 0) == kCFCompareEqualTo))
                FSCatalogInfo info = {0};
                if (FSGetCatalogInfo(&ref, kFSCatInfoVolume, &info, NULL, NULL, NULL) == noErr)
                    GetVolParmsInfoBuffer params;
                    if (FSGetVolumeParms(info.volume, &params, sizeof(params)) == noErr)
                        std::cout << "Removable " << (int)((params.vMExtendedAttributes & (1 << bIsRemovable)) != 0)  << "\n";
                        std::cout << "Ejectable " << (int)((params.vMExtendedAttributes & (1 << bIsEjectable)) != 0) << "\n";
Method 3 with "DADiskCopyDescription"
    DASessionRef daSession = DASessionCreate( kCFAllocatorDefault );
    if ( daSession )
        DADiskRef disk = DADiskCreateFromBSDName( kCFAllocatorDefault, daSession,  "disk1s2");
        if ( disk )
            CFDictionaryRef desc = DADiskCopyDescription( disk );
            if ( desc )
                CFBooleanRef ejectable = (CFBooleanRef)CFDictionaryGetValue( desc, kDADiskDescriptionMediaEjectableKey );
                CFBooleanRef removable = (CFBooleanRef)CFDictionaryGetValue( desc, kDADiskDescriptionMediaRemovableKey );
                CFBooleanRef writable = (CFBooleanRef)CFDictionaryGetValue( desc, kDADiskDescriptionMediaWritableKey );
                std::cout << "Ejectable " << (int)(ejectable == kCFBooleanTrue)  << "\n";
                std::cout << "Writable " << (int)(writable == kCFBooleanTrue)<< "\n";
                std::cout << "Removable " << (int)(removable == kCFBooleanTrue)<< "\n";