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I've read this:

I'm looking for the same but I got ICH4M not ICH8M.

There is 1011 by default.

This is limiting my SSD drive to 99 MB/s read and only 24 MB/s write :/

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Can you confirm that you are incorrectly detecting a 40-pin cable? – David Schwartz Aug 17 '12 at 11:52
Yes. It's shows such message when booting Linux. – Spacedust Aug 17 '12 at 11:58
Also take a look at my read speed. I need to force the drive to work in UDMA6 mode in hdparm. This is A-Data S396 30 GB drive in SATA to PATA caddy. – Spacedust Aug 17 '12 at 12:40

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