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SubjectRe: What still uses the block layer?
> You can pull a Model and Serial number via hdparm -i, but it's not as
> easy to manipulate as a fixed-length MAC address. That's why people
> tend to use filesystem UUID's.

ATA8 at the moment looks set to add a true "MAC" or "WWN" type identifier
to each device.. Right now model/serial is not always unique.

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