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DADiskEject and Resource Busy errors

I'm using the DiskArbitration framework for unmounting and ejecting removable CD media.  I have run into a peculiar issue where sometimes CDs unmount successfully, but fail to eject.  My code looks like:

Unmount the disc in preparation for ejection:

DADiskUnmount(disk, kDADiskUnmountOptionWhole, unmountCallback, context);

If the unmount was successful, request the eject in unmountCallback:

if(NULL != dissenter) {
DAReturn status = DADissenterGetStatus(dissenter);
// Error handling omitted
}


DADiskEject(disk, kDADiskEjectOptionDefault, ejectCallback, context);

And finally, the code that produces the error message:

if(NULL != dissenter) {
DAReturn status = DADissenterGetStatus(dissenter);
// Error occurs here
}

The strange thing is, maybe 50% or more of the time the disc will unmount but fail to eject with an error code 16 (Resource Busy).  I assume since the disc successfully unmounted that no resources should be in use.  I don't see any other DA* APIs that will do what I want.

Have I missed something in my usage of the framework?

Stephen
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