if just one of the two hd's fail in a RAID 0 array, you lose ALL your data..
to fix this, you should find another hard drive of similar specs if not the same hd to recreate a raid array..
i have 2x 250gb in raid 0 with a 1tb hd for backup/storage.. since i know that if i lose 1 hd in the raid, ill lose all my data, i backup anything i need from the raid onto my slave..
not sure if you have to delete your current broken raid array before you recreate another one.. but you would have to "create" the raid array before you can use raid again..
maybe you might want to look into more backup solutions or consider not using raid if you dont care.. just an opinion