sata hard disk

How do I find out my SATA link speed? How do I make sure my sata hard disk is working at 6Gbps speed and how do I verify this on a Linux server running on HP or IBM amd64 hardware?

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How do I see attached scsi devices for my IBM Linux server powered by Red Hat Enterprise Linux 5 or 6? How do I list all sata hard disk names under Debian or Ubuntu Linux?

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