You need RAID if you want reliability.
Why do you think it's a bad idea?Is using 7200rpm HDDs for storage a bad idea?
Why do you think it's a bad idea?
What mirror software do you use?
Which single HDD can read/write more than 150 MB/s???due to your BIOS limitations, you can only choose anything <2Tb and besides it will be limited to 200+ MB/sec read/ write rate cos thats SATA 2 throughput
