I'm trying to clone hard drives using an ISC Image MAsster 4008i cloner. If the master drive and the target drive are not the exact same make and model number, it fails every time. For instance, if I try to clone a Western Digital WD2500AVJS from a Western Digital WD2500AAJS it says it failed and the hard drive won't boot up completely. My company is starting to update it's hardware but it's no fun installing windows 7 and other software 5 days a week when they could be cloned in a fraction of the time. If anyone could shed some light on this, I'd greatly appreciate it.