You are correct in that the I/O Kit path is the most appropriate
solution in absence of a unique ID. You can obtain the I/O Kit path
to the device with kDADiskDescriptionDevicePathKey in Disk
Arbitration. It returns a device tree path where one is available,
but otherwise returns the service path.
The exception to the rule is USB. You need to take into account a
property unique to USB to identify the location of the device on the
bus. It is not encoded as part of the I/O Kit path. I believe
kUSBDevicePropertyLocationID is the appropriate property.
Dan
On 18 Dec 2007, at 8:47 AM, Stephen F. Booth wrote:
Hello all,
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:
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.
This is a good idea; unfortunately IORegistryExplorer does not show
a serial number for my drive, just the same information I could get
already (the Protocol and Device characteristics).
I'm thinking of using the IOPath together with the manufacturer's
name and model number as the identifier. It won't be guaranteed to
be unique, but hopefully it will be close enough since identical
devices at the same IOPath should probably behave the same!
Stephen
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