We had hard drives completly dying...purchased about 100 pcs, and all of them had to have the hdd replaced, randomly just complete fail - not detecting the hdd at all. As i said though Stone support if top class, never had 1 problem with them whatsoever, and this was the first major failure we had with them...which was nothing to do with them anyway!!! Due to this though, and nothing to do with me we moved off Stone to another big supplier..(who's support isn't as good by miles !!!)