Originally posted by: opk
In a word, no.
The nature of the RAID is that it sets up everything beforehand. Your system only sees one big 160MB volume. The raid controller sets up (in the case of raid 0) stripes across the drives. Right now you have every other stripe on every other drive. In a raid 0 across 3 drives, it's every3rd stripe on every 3rd drive. It's in no way expandable.
As opk and Smilin said, RAID 0 is in no way expandable. Don't use a hack unless you don't care if you loose your data. RAID 5 is expandable, but that's not what you have.
If you are using Windows 2000 or XP there is another option.
For better reliability, don't use hardware RAID 0, but use NFTS symbolic links with basic disks, not dynamic disks (for backup and restoration issues, dynamic disks are hard to work with).
When using symbolic links, there is the ability to assign a drive to any empty directory/folder (not a drive letter) and any subsequent access to that directory/folder actually correlates to the newly assigned drive/partition. The number of drives and symbolic links in Windows 2000/XP is unlimited (not limited by drive letters).
This may be a better way to store your stuff. Only use RAID 0 for temporary fast storage/access (like video editing, movie making) or for uniportant data, like games or sofware which can always be reinstalled.