Dutch100, please allow me to check on additional information for this issue.
Thank you Sylvia. I can confirm that windows only recognises the original 500 BG of space as I am now at capacity on my HDD and cannot copy any new files to my PC. Also I thought maybe that the new 1TB HDD did not complete the RAID setup, so I tried disconnecting to go back to my original single 500BG HDD setup, but my PC would not boot up - so a RAID had definitely been established with data on both hard drives. I am really stumped, thank you for looking into this problem.
Dutch100, thanks a lot for your patience.
It looks like your system was set up as “RAID ready”, that is the reason why it asked you to set the new HDD as part of the RAID.
What happens is that since the system created a Raid 0, you lose about 500 GB from the new HDD
A Raid 0 consists of striping, without mirroring or parity the data. Therefore some information will be on one HDD and other of the 2nd HDD. That is the reason why some programs are not opening correctly or cannot start at all.
This is not an issue related to the Rapid Storage technology.
Now that you disconnected the 1TB HDD and you are not able to access Windows, is because some registry keys were copy on that disk and they are necessary to complete the boot and get into the Operating System.
My recommendation at this point will be to connect the HDD again, try to access Windows, back up all the information that you can and created a new RAID from scratch
If you are still interesting on creating a RAID on this computer, I would recommend you getting another 1TB HDD, that way if you create a RAID 1 you will have about 1TB of storage, but if you create a RAID 0 it will be 2TB.
You can also contact your system manufacture so they can provide you more information on this behavior.
Some additional information could be found at these links