Major advanatage is you can use some space from 1 HD for backup in case the other/main one fails.owon said:What about this
Western Digital Caviar SE16 320GB 3200KS SATA-II 16MB Cache - OEM (HD-070-WD)
It will save me £35 and still have large storage I was origianlly going with this drive in the first pace but was advised to go with 2x200 gig as they are more reliable is this true.