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Hi Andy, you would probably be fine with either rotational speed given the interfaces on these units (USB2 / FW).
However as you have 4 drives running together the drive manufacturers only rate their NAS (or Enterprise) drives for this configuration due to the mutual vibration of the drives, thus either WD Red, or Seagate Ironwolf are the choices if you want "Manufacturer Supported. This means that you only have 7200 RPM drives available.
The manufacturer documentation mentions "Tested" so the others may be not be tested but capable of running 4 spindles in one chassis maybe. Depends on how important the data is and whether you want to run drives in an "unsupported" configuration.
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