IDE and USB hard disk detection.

Hello, I would like to receive support on this issue.
Using the bootable ATIH 2012 disk, I am trying to backup an old machine, in order to virtualize it.
It is a HP ML 350 G3 computer.
It has a hardware RAID controller, HP 642, with two logical disks.
First of all, I needed to generate the bootable disk passing a parameter: PCI=BIOS. Otherwise the computer hangs when ATIH tries to recognize the disks (messages on the screen state that ATIH does not recognize the hardware RAID controller and tries to read the phisical disks configuration. At this time boot procedure freezes, probably because of a conflict between ATIH and the RAID controller).
Well, giving the parameter mentioned before, ATIH recognize the RAID controller but another error message comes out on the screen.
I wasn't able to read this message because immediately after its appearance, it comes out a different image that substitutes the screen content. I tried to stop the boot procedure pressing Pause or Interrupt keys on the kbd but without success.
The problem is the following: having connected to the computer an external USB disk, then booted the computer with the CD media passing the PCI=BIOS parameter, when I look at the disks and partitions in Backup section, I actually find the two logical RAID disks but there is no way to see the USB disk.
The computer has another controller, that is an IDE one, to which is connected the CD ROM drive and to which I connected an IDE disk (I tried this way instead of using the USB disk).
Also the IDE disk is not recognized.
The "funny" thing is that if I start the same computer using Acronis Disk Doctor 10 or Paragon Partition Manager 10 Server version, they are both able to see the USB or the IDE disks. And they are both able to clone disks or partitions using the added disks as destination.
With these two pieces of software I did not pass any special parameter when I prepared the bootable disks.
I also suspected that ATIH does not support mixed file systems environment, so while at the beginning the USB or the IDE disks were NTFS formatted while the computer is a Linux box, I decided to format the USB and the IDE disks, changing their file systems to Ext3, so a Linux file system.
I was wrong, nothing changed.
Also nothing changed when I added a second parameter to the ATIH bootable media: PCI=BIOSIRQ.
What should I do to overcome to this issue?