Vista - Solution for "may not support booting" error

Initial Vista installation from DVD may result in:
"This computer's hardware may not suport booting to this disk".

See KB article that relates that it is due to non-initialized disks.
But that was not the case with mine. They were both initialized and partitioned.

The article says the root cause is Vista's inability to tell the disks apart and that's when it made sense to me. My disks are identical models.

Solution: in BIOS I disabled the secondary disk.
The error message went away (even though the disk showed up duiring install!) and installation is finally (24 hours later) continuing.