Re: SATA speed. Should be 150 or 133?

From: Mark Lord
Date: Fri Jun 24 2005 - 10:46:55 EST


True SATA drives ignore the "transfer speed",
as it really is meaningless and does not apply.

So, am I the the only person confused by this message? ;)
There is "SATA max UDMA/133" not "PATA max UDMA/133".

No, it really is as confusing as it sounds!
The drive is SATA, but the transfer speed gunk only
applies to the internal "PATA" portion of the drive,
which communicates to the built-in SATA bridge chip
of the same drive, which in turn presents a pure SATA
interface to the host computer.

Oh, so how to check true (current) speed?

Same as always: hdparm -I /dev/sd?
(requires the libata-dev "passthru" patch
recently reposted here by Jeff Garzik).

cheers
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