Can we change the name of this thread to say 4100 not 4200.
Buy 4 matching 120 gig drives. pull all the drives out and replace with new drives.
Boot up the snap server wait 2 minutes then hit it with a web browser by its ip address. Login as admin and go to Disk Utilities/View Disk Status and watch as it formats all the drives.
The OS is in FLASH MEMORY and not on the drives. When its done formatting the drives you can build a new raid array somewhere around 390 gigs a hell of alot better then the 90 gig raid array you have now.