From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Smietanowski Subject: Re: SATA speed. Should be 150 or 133? Date: Sun, 26 Jun 2005 20:44:57 +0200 Message-ID: <42BEF7A9.2070202@stesmi.com> References: <42BB794B.6080109@rtr.ca> <42BC284E.7050202@rtr.ca> <42BE0B7D.4050307@rtr.ca> <42BEB4B0.8090405@pobox.com> <42BEE126.6070208@pobox.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from mxfep02.bredband.com ([195.54.107.73]:36072 "EHLO mxfep02.bredband.com") by vger.kernel.org with ESMTP id S261549AbVFZSjq (ORCPT ); Sun, 26 Jun 2005 14:39:46 -0400 In-Reply-To: <42BEE126.6070208@pobox.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Jeff Garzik Cc: Krzysztof Oledzki , Mark Lord , linux-ide@vger.kernel.org -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi. This is directed toward Krzysztof and not you Jeff. >> So, excuse me for asking this question again: how to check true >> (current) speed? I still don't know if this disk uses UDMA/133 or >> SATA150. > > > This is an irrelevant question, because the answer is "both." > > The SATA bus speed is always 1.5Gbps, 3Gbps, etc. but the device must > also set udma speed (udma0-6). Or simply speaking, if your device is SATA150 it has a 1.5Gbps link to the IDE chipset always. If the device is UDMA133 with a bridge (built-in or external) then the link is 1.5Gbps between the IDE chipset and the bridge and UDMA0-6 between the drive and the bridge. Many older SATA drives were nothing more than UDMA133 drives with a bridge and I believe most (all?) used a UDMA133<->SATA150 bridge by Marvell. So if you want a finite question : Look on the electronics board of the harddrive and if you find a Marvell chip near the SATA connector then your drive is UDMA133 with a bridge chip. You can naturally check any resources on the internet if you so chose. // Stefan -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (MingW32) iD8DBQFCvveoBrn2kJu9P78RArhJAJsEvbtbhvvUYjwYh46hRKVMmN6UiACgjGAr AjR46vZNydzIR0tMDLg1CKc= =t20w -----END PGP SIGNATURE-----