Hello Martyn,
All our new nodes for Windows
VPS Hosting hosting are setup with RAID5. RAID5 is the best option for Windows Servers as it improves Disk performance as well as HDD reliability. Some of our old servers in 2006 were setup without RAID but now we have RAID on most of our servers and we have better technique to restore servers in case of failure.
We have drastically improved level of our Service in last 12 months and we are continuing to improve. Problems cannot be avoided with servers in shared environment but we have procedures to bring everything back to normal on a troubled server within no time.
Dell has started offering good discounts to us from last couple of months so now we have started ordering servers with SAS drives which has improved uptime of our new servers. Our target this year is to improve our average uptime from 99.96% to 99.97% and hopefully we will make it possible this year.