RHEV: Unable to install older RHEL version with virtio type block device.
Issue
- When trying to install a virtual machine with RHEL 4.6, Received an error indicating drivers for the hard driver not found. Same problem not observed when trying to install RHEL 4.9.

Environment
- Red Hat Enterprise Virtualization 3.X
- Red Hat Enterprise Linux 4.8 and lower, 5.4 and lower
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