I have 4 caviar black 1.5tb hdds in a software raid0. I run as a big 1 partition osx so it is 6tb in size and has 2.3tb of info 3.7tb empty. I just did AJA test DiskWhack Test and got Write 405MB/s Read 416 MB/s with cache disabled. 4gb test. With cache on I need to run a 16gb test and still get 400MB/s read write. I was not getting above 350MB/s but I fixed permissions and got some nice results. The 2.3tb of info would be a lot to lose but I have 3 copies of it. So far I have to say the 400MBs read write is pretty fine speed for 7200rpm hdds. xbench is giving me good results but slower. write read of 292MB/s __ 313Mb/s 256k blocks sequential. of course with xbench random read 4k is the low and the only weak number it is 3.95MB/sec still for 440 dollars worth of hdds from newegg. the scores are very good. and I get 6tb of space. makes me think twice about ssds for now. todays score http://db.xbench.com/merge.xhtml?doc1=474972&doc2=1&setCookie=true xbench scores for the pro http://db.xbench.com/search.xhtml?text=zzzzz+phil these caviar blacks are pretty nice but they have 1 weak point in raid0 they don't do 4k blocks in random read well. So my software raid would not be the best solution for people that are running jobs that have lots of small block random reads. still a 6tb osx that is fast for a lot of jobs is nice. drives have a 5 yr warranty. if you back them up with a few backups it seems to be a plan for now.