I need to store some metadata about various CD drives, and have that
information be accessible across reboots. I have a few ideas but I
haven't figured out the best way to handle things yet. My current
code does the following:
1) Registers with DiskArbitration for IOCDMedia events
2) When an event occurs, I grab the IOPath from the DADisk's
description and match that with an io_service_t
3) I inspect the io_service_t's properties, particularly for
kIOPropertySCSITaskUserClientInstanceGUID
4) I use the GUID to uniquely identify the device
Here is where I am a stuck; I would have expected that the GUID
remains the same across reboots, but empirical evidence suggests
this is not the case. So I can't use the GUID as a key for drive
identification. This may be a good thing, since ROM drives may not
be STUC devices and as such wouldn't have a GUID anyway.
My next idea was to use the drive's serial number via
kIOPropertyProductSerialNumberKey, but while
IOStorageDeviceCharacteristics.h says the key is mandatory it is
missing for my drive:
My third idea is to use the IOPath of the device, but is this a
reliable way to uniquely identify a CD device? I have a feeling it
isn't, but I'm not quite sure.
Is there another way to accomplish what I am trying to do?
While I can't necessarily provide the answer you are looking for, what
I can suggest is checking to see if IORegistryExplorer can see a
serial number for your drive. If it does, then it would suggest that
there is a way to get it.
Andre
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