I'm "rebuilding" my raid -- do I need to "erase" my raid's hard drives

As some of you know I've been having a weird problem with my raid. One of my drives is failing but for whatever reason I am unable to replace it and create a "hot spare" and then expanding it to re-create my raid.  There's some
I am finishing my current project today and plan to start today or tomorrow  the tedius process (well at least time consuming) of redoing my raid.
I have 4 drives, and know which one has been failing.  So I have my new drive ready to go.   (Actually I bought an extra drive so in theory I have a total of FIVE hard drives, in case that is helpful in your suggestions.)
I have done a total backup of my files, so I am wondering if I need to "erase" the data on the 3 drives that I will be re-using.
I will be going over my old notes to remember how I created my raid, but if you have any suggestions for me as I "start from scratch" let me know.
I have also ordered this and will be picking it up today:   http://www.newegg.com/Product/Product.aspx?Item=N82E16816212014
Rowby

The fix of the raid is apparently finished.  The Volume state is back to NORMAL, reports the Areca Raid Storage manager.
However the raid is showing a capacity of only 3TB
Showed that also after a reboot of computer.
Do I need to do anything to get it to be closer to 4TB  (I have 4  1-TB drives.
See attached screen capture.  I have 4 drives in the array.  Each 1tb.
See attached screen capture.
WIndows explorer is showing the capacity of the raid as 2,999,862,696 bytes. 
thanks
rowby

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