Re: SATA speed. Should be 150 or 133?

[Stefan Smietanowski <stesmi@stesmi.com>]

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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
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