hello @hexagramme You can install your 3.5" HDD as shown in the picture, for this you have to pull out the plastic slide, see here from minute 6.05 https://www.youtube.com/watch?v=TnbRDepF4Es Below the Hdd you can also screw 2 SSD 2.5" firmly to the housing. From a test report: A 3.5-inch HDD can be clipped into the carriage and pushed into the space provided without tools and decoupled by small rubber buffers. There are twice as many and thus two places for SSDs. They are hooked directly under the HDD slide on one side and screwed on the other from the right or left side. The connection side thus points in the direction of the power supply unit. You're right, of course, you need electricity for the HDD, I didn't consider that today's power supplies no longer have a cable harness with many connections, just one sockets on the back of the power pack and depending on what you need you plug in your power cable. https://seasonic.com/focus-plus-gold now i don't know what medion supplies in the accessory pack, you may have to buy another cable. bye Fishtown
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