External SSD has increased the response time of the MS Virtual PC for Mac running XP Pro. The Apple OS X also boots up faster and is more responsive. The original HDD is still available if needed. Great technical learning experience.
USB external connection with SATA adapter worked well on the Apple G5 iMac; Erased (formatted) the SSD; Used CCC to clone HDD; That worked well; Needed to enter Open Firmware to change configuration to boot OS X from the external SSD; Good performance so far
First try with SSD installed internally didn't Boot; Didn't know about Open Firmware at the time of the try; May need to modify the configuration in Open Firmware to boot with the internal SATA connection