Yes, it is risky. If you want the speed then you have to pay for it with reliability. JBOD is the way to go if you just want one large drive, you don't get the performance boost but you don't lose reliability. I've never used it but apparently you can lose a drive and still have the overall integrity intact and be able to recover the files. If you can still use the 'array' when a drive has failed, I don't know.