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DiskArb DiskChangedCallback bug?

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With the new 10.4 DiskArb API, the explicit mount/unmount callbacks were removed and instead you are supposed to use DARegisterDiskDescriptionChangedCallback():

/*!
* @constant kDADiskDescriptionWatchVolumePath
* Predefined CFArray object containing a set of disk description keys appropriate for
* watching volume mount changes using DARegisterDiskDescriptionChangedCallback().
*/

extern CFArrayRef kDADiskDescriptionWatchVolumePath;

However, there's seems to be a bug with this on 10.4.6 (PPC, haven't tried Intel) in that the callback is never called for volume mounts, only for volume unmounts.

Here's a test case. If you set a break point on DiskArbCallback_ChangeNotification(), and then insert a disk (I tried an AudioCD and a USB FAT flash drive), the breakpoint is not hit when the volume mounts, but when you eject it, gdb stops.

I've opened a bug report: rdar://4582301, but I wanted to see if perhaps I'm missing something or if there is an actual bug, is there some kind of workaround to detect a mount?

Thanks.

// cc -g -O0 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -framework Foundation -framework DiskArbitration -o datest datest.m
#import <DiskArbitration/DiskArbitration.h>
#import <Foundation/Foundation.h>

static DASessionRef daSession = NULL;

static void DiskArbCallback_ChangeNotification(DADiskRef disk,
CFArrayRef keys, void * context)
{
NSDictionary *d = (NSDictionary*)DADiskCopyDescription(disk);
NSURL *path;
if (d && (path = [d objectForKey:(NSString*) kDADiskDescriptionVolumePathKey])
&& [[NSFileManager defaultManager] fileExistsAtPath:[path path]]) {
printf("Volume mounted on: %s\n", [[path path] fileSystemRepresentation]);
} else if (d && (!path || NO == [[NSFileManager defaultManager] fileExistsAtPath:[path path]])) {
printf("Volume unmounted");
}
[d release];
}

int main(int argc, char *argv[])
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    if (NULL == (daSession = DASessionCreate(kCFAllocatorDefault)))
      return (ENOMEM);

DASessionScheduleWithRunLoop(daSession, [[NSRunLoop currentRunLoop] getCFRunLoop], kCFRunLoopDefaultMode);
// Since there is no explicit mount callback, the Change callback is how we detect a mount.
DARegisterDiskDescriptionChangedCallback(daSession, NULL, kDADiskDescriptionWatchVolumePath,
DiskArbCallback_ChangeNotification, NULL);


    [[NSRunLoop currentRunLoop] run];
    return (0);
}
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