I've had poor experience with drive trays. They tend to fail rather regularly.
You can use the external enclosure as a removable drive bay by simply leaving the case open and swapping the drives in it. It's one step more than hot swappable. All you have to do is unplug the usb cable before swapping the drive in the enclosure.
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I have gained this from philosophy: that I do without being commanded what others do only from fear of the law. - Aristotle
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