P5B doesn't have RAID support.

[Wiz33]

Just a word of warning for those oconsidering he P5B (non-deluxe) as the so call RAID 0,1 support from the JMicron just does not work. It only have 1 internal SATA connector and one eSATA external connector. While theorotically you can use a eSATA multiplier board ($80-$120) to to give you up to 5 SATA connector so you can run RAID. There is an additional problem that once you set the JMicron controller to RAID in BIOS. It knocks out you primary (and only) IDE bus so you can't using any optical drives unless you get a SATA version. It really messed me up my new PC and I ended up having to spend another $70 to get a PCI-E 2 channel SATA II RAID card to get my RAID setup running. Isn't this borderline flase advertising?

[MrDeeds]

There is an additional problem that once you set the JMicron controller to RAID in BIOS. It knocks out you primary (and only) IDE bus so you can't using any optical drives unless you get a SATA version.

The sata settings on the Jmicron controller shouldnt have any effect on the pata controller in any way. The only way your pata controller stops functioning is if you totally disable the Jmicron Sata/Pata controller. There isnt an issue with the raid support, the jmicron supports raid just fine. Its just that it only offers 1 internal and 1 external sata port. You can call the layout comical and even idiotic but its not false advertising. Its on the asus website as clear as day.

[Wiz33]

That's what I'm saying. What they say in the manual is not true, the JMicron controller does not keep IDE mode if you set it to RAID.