If you set up two 500 GB drives in Raid 1, the RAID array will have a 500 GB capacity. The two drives are Mirrored. That is to say, the controller, together with the RAID software, causes the same data to be written to both drives. If you set up in RAID 0, the controller and software 'stripe' the data, writing part to one drive and part to the other. The capacity becomes 1 TB. RAID-0 is not RAID at all since it provides no redundancy of storage, the 'R' of RAID.
To simplify, for most systems, setup goes like this:
- Enter the BIOS and set the controller mode to RAID.
- Continue booting or reboot, depending on the BIOS.
- Enter RAID setup.
- Select the RAID type.
- Select drives to be used.
- Initiate setup.
- Reboot.
- Partition and format the array.
Do be sure to check the manual for your computer's motherboard.
Tom Ferguson