Thanks Dan, getMatchingServices() does exactly what I need. Having the IOService object for the devices I want to talk to is going to be a huge help. The key was finding the OS classes in libkern that let you do CoreFoundation type things in the kernel. Here's the code for anyone who's interested: OSDictionary* services = IOService::serviceMatching(kIOMediaClass); if (!services) return; OSIterator* iterator = IOService::getMatchingServices(services); if (!iterator) return; while (true) { IOService* service = OSDynamicCast(IOService, iterator->getNextObject()); if (!service) break; printf("name: %s\n", service->getName()); service->release(); } iterator->release(); services->release(); Sam On Thursday, May 29, 2003, at 15:00 Australia/Melbourne, darwin-kernel-request@lists.apple.com wrote: If the volume management could be done in mostly in user space, all the better, easier, safer, etc, but if not, what you want is doable of course. You can look up the media objects by BSD name or all media objects by IOMedia class, just as in user-space. See getMatchingServices(). _______________________________________________ darwin-kernel mailing list | darwin-kernel@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.