12
Hardware and firmware support is present to take advantage of the future Microsoft Vista operating sys-
tem. Intel Matrix Storage Technology RAID software support for Microsoft Vista will be available at a later
date.
HP Compaq dc7800 Business PCs are based on the Intel Q35/ICH9-DO RAID chipset, which is a com-
bined hardware and software RAID solution. The Intel ICH9-DO SATA mass storage controller allows all
drives to operate in IDE or RAID SATA modes. Each mode of the controller means a different PCI control-
ler, with different device ID, class code, and driver support.
NOTE: HP recommends and only supports Microsoft’s IDE driver stack based on the ATAPI.SYS driver for
HP Compaq Business PC products including all supported RAID configurations.
WARNING: The PCI Device ID of the mass storage controller changes after changing IDE mode. Chang-
ing the BIOS from IDE mode to RAID mode is the equivalent of connecting the hard drives to a new add-
on RAID storage controller. The installed operating system on the hard drive is unaware of this new mass
storage controller. If the operating system does not have the RAID drivers enumerated and PnP for the
RAID controller, the operating system will fail to boot (blue screens) when Microsoft XP or Microsoft Vista
attempts to boot.
Table 5 RAID Drives
Mode Purpose Minimal HDD Required
RAID 0 Striped for Performance. 2
RAID 1 Mirrored for Protection. 2
RAID 5 Parity for Accuracy. 3
RAID 0 + 1 Mirrored and Striped. 4*
Intel’s Matrix Technology 4 logical drives on 2 physical disks,
to emulate RAID 0 and 1.
2
* Not supported on HP Compaq dc7800 Business PCs.
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