Without VM Additions, tasks like OS installation or "Virtual SCSI" will take
a long time no matter what, and there are no workarounds.

I suggest using IDE during entire OS installation, then swap over to SCSI
after OS install is complete with the following procedure:
1. With the newly installed VM, power it off and add a virtual SCSI
controller
2. Power on the VM and let Guest OS Windows install SCSI controller drivers.
Then, power the VM off again.
3. Remove the original VHD attached onto virtual IDE bus and re-attach the
VHD file onto the virtual SCSI bus.  Turn on the VM.
4. Voila.  You now have the virtual VHD on SCSI in the VM.

I'd like to be able to use the Virtual SCSI driver to gain speed on my
virtual hard disks. My problem is that if I install an OS the process is
abnormally slow (figure 6-8 hours to install Windows). Once I can get the
additions loaded then everything is fine, but this is not practical for me
as
I need to be able to get VMs up quickly. What can I do about this? Can I
leverage the F6 option in setup to load the additions driver ahead of setup?

Sam

You only need to install an OS once,  after that use tools like
sysprep to copy and modify the original OS install.
Steve Jain, Virtual PC for Windows MVP
Website: http://www.essjae.com
"This posting is provided "AS IS" with
no warranties, and confers no rights.
You assume all risk for your use."