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SubjectRe: IDs
>> The id is not suitable as a user space name. Moreover,
>> it is a heuristic only, and user space needs unambiguous names.

> If we had a complete white/black list of devices with/without a unique id,
> there would be no ambiguity.

You mean for the devices on the white list.
But most devices will not be on the white list.

Our perceptions differ, I think. My impression is that chaos
is the norm, and well-behaved devices are the exception.
I find very good behaviour in fixed hard disks.
Stuff by Maxtor, Seagate, IBM, etc - a very small collection
of very experienced manufacturers with high quality products.
SCSI CDROM drives or tape drives or scanners are messier.
USB storage devices are much messier - very basic parts of the
protocol are regularly broken.
So to me the approach of an id together with a blacklist
seems unworkable.

As you say - we can make a best effort and get a string that
with some luck identifies the device uniquely. But no guarantees

Maybe that again means that the S/Z distinction can be dropped.

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