Drobo Robotics User Manual page 27

Once you've chosen the number of drives and which capacities to
install, all you have to do is remove your DroboPro's face plate by
simply pulling it off and then slide the drives into the Data Bays. It
doesn't matter which drive goes into which Data Bay. You should note
that any pre-existing data on the drives will be erased. Be sure not to
touch any exposed hard drive circuit boards after unpacking.
First orient the drive
connectors so that the
connectors are pointed
towards the DroboPro and
they are facing the left side of the
DroboPro. The top silver colored plate
of the drive should be facing to the right. Open the Drive Lock by
pressing it down and slide the drive into the Data Bay until you feel the
connector "mate" at the rear of Drobo. If the connectors seat properly,
the Drive Lock will snap behind the drive, securing it into place.
Warning! Do not place your DroboPro on its side during normal operation.
There is a chance the drives will disconnect if you do this. For optimal
performance and protection of your data we recommend that DroboPro remain
in its normal horizontal position.
There are several ways to connect DroboPro to your computer. You
should select the fastest connection you have available. Please note
that only one connection type can be used at any given time. The
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