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hdparm -y /dev/sdbworks!hdparm -Scan get the value. The manual says "set", while for some other options it explicitly says "get/set". And there is this answer which may or may not be right, but ifhdparm -Sever worked for getting the value then I guess some answer there would advise it. I've seen other similar threads, some advisehdparm -I … | grep level(which I believe is totally wrong) but none adviseshdparm -S. IMO the error you got tells nothing about your drive. Maybe you're right something is wrong, but the error has nothing to do with it.