i have 2 Seagate Backup Plus 3TB USB 3.0 3.5" Desktop Hard Drive STCA3000101 External Drives connected to an Esxi Ver 5.5 U2 host and every week or so the drives will not be seen and i have to power cycle the drives to make them appear in the VM and host. Looking at the reviews on newegg the drives suck. So its probably that both drives are bad. They are only 1.5 years old. Is there anything else i can check to see why the drives are disconnecting and is there a 4TB drive that you can recommend?