Ok in my AMI BIOS v02.58
The HD had the following wrong settings.
LBA/Large Mode: [Disabled]
Block(Multi-sector Transfer) M: [Disabled]
PIO Mode: 
DMA Mode: [UDMA2] ( <--I think it was set to this)
SMART Monitoring: [Disabled]
32Bit Data Transfer: [Disabled]
Again this game me the following 2 symptoms:
- Bootscan /LIST /REBUILD [Failed with no results or error as stated in previous posts]
- Occasionally any Windows XP Boot Disk would boot to a Black Screen immediately after "Setup is Inspecting your computer's hardware configuration"
I then changed those settings to AUTO or ENABLED
LBA/Large Mode: [AUTO]
Block(Multi-sector Transfer) M: [AUTO]
PIO Mode: [AUTO]
DMA Mode: [AUTO]
SMART Monitoring: [AUTO]
32Bit Data Transfer: [Enabled]
All the significant symptoms are gone now.
Although there is no error on Bootcfg /scan it still does not find the existing OS on drive C:\Windows
But Bootcfg /List works. and I didn't really want to try Bootcfg /Rebuild at the present time.
My previously installed programs are working with the existing XP Pro. I am pleased but the questions remains.Why? If anyone can explain why these setting would produce one or both of these assumptions it would be helpful to me and many trying to learn.
Actually I think I read somewhere that old XP or NT systems could only read 7.8GB at least on the primary partition until LBA, Large Block Addressing was introduced (I think). But I don't know if that has anything to do with this. if anyone is rock solid confident to explain this please do. Thanks in advance!
Now one more thing.
Referencing the picture from the fist post in this thread, the "new Good XP Pro" is now BUT now instead of Drive D it is on Drive C:
And many things are still point to Drive D:
I am sure there is a quick way to change that right? Can anyone provide the answer that one too?