The best method is to use a product such as ghost or drive image to create
an image of the drive and then reload it. In your case this probably won't
work as a RAID 0 of 2 x size x GB drives won't fit onto 1 drive of size x
(either a single drive or mirrored).
That is assuming that you ahve 1 partition covering all of the stripe. You
could use a product such as partition magic to reduce the size of the
partition such that it would fit onto one drive, then image the single
partition off then back onto newly created mirrored drive pair - that would
work.
As you no doubt know by now, system drives should *never* be striped. It is
suicide.
Don't be surprised to find that the 'failed' drive in the strip passes all
hardware tests and has no new defects on - this is the nature of raid. In a
non reaid 0 config, the principle task of raid is to protect data from
corruption, so having drives chucked out by the raid is normal.
- Tim