The guide outlines the ins and outs of RAID, addresses the different levels of RAID, and shows how to install a basic IDE RAID setup in your PC to maximize performance. Data in a striped array is interleaved across all the drives in the array.
Data is read and written on both drives at the same time.
You can take a pen and write it. Now, imagine for a second that you were a mythological God or something and could write with both hands, nice and neat, at the SAME time. This theory applies to a RAID array using striping.