Oh, regarding those RAID drives: if an identical drive isn't available, at least stick with one from the same manufacturer (with same geometry). One "catch" is that the formatted capacity of drives varies slightly between manufacturers.
A Seagate 80GB drive may have a formatted capacity that's 10Mb bigger or smaller than an 80GB western digital drive.
When mixing brands, you risk that your new disk is too small to become part of the array. (Or you end up with a couple of extra MB that will sit unused -- that's fine, but you rarely know for sure which it will be up front. :-?
A Seagate 80GB drive may have a formatted capacity that's 10Mb bigger or smaller than an 80GB western digital drive.
When mixing brands, you risk that your new disk is too small to become part of the array. (Or you end up with a couple of extra MB that will sit unused -- that's fine, but you rarely know for sure which it will be up front. :-?