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I have an HP Pavilion Ultimate d4995t desktop.
I cannot seem to setup any RAID mode other than 0 or 1 in either the Intel add-on ROM 126.96.36.1997 or in the Intel Rapid Storage Technology. The choice just is not available (RAID10 is visible but greyed out in IRST, RAID5 is not listed at all).
It has Intel(R) ICH8R/ICH9R/ICH10R/DO/5 Series/3400 Series SATA RAID Controller which shoud allow 5, 10.
It came with 1 WDC WD5000AAKS-00V1A0 and I've properly installed 2 more.
The BIOS is set to RAID.
It works for RAID0. All the Intel documentation says it should do RAID5 & 10