One problem with utilizing unencrypted drives is that if there's a hardware failure, it's more expensive to dispose of them. Normally Amazon overwrites the data

One problem with utilizing unencrypted drives is that if there's a hardware failure, it's more expensive to dispose of them. Normally Amazon overwrites the data, degausses the drive and then destroys it, but if, say, the electronics is faulty, the first step becomes more difficult.