In this build I took a Supermicro CSE-846 4U chassis and turned it into a JBOD disk shelf with 40 total drives for about 720TB raw. The case starts with 24 front bays, and then I added another 16 drives inside the chassis using simple aluminum channel from Lowe’s and a pair of inexpensive backplanes. I walk through the whole plan, how I mounted the drive “blocks,” how I handled SAS cabling, and how I brought an external SFF-8088 connection out the back so it can live in the rack like a proper disk shelf. A big part of this video is the practical sysadmin stuff: powering a lot of disks safely, and keeping them cool. I used a Lenovo SAS expander that only needs power (not PCIe data), so I fed it with a cheap PCIe riser power board. For drive power I built a harness using ATX/CPU extension cables so I didn’t have to cut the expensive Supermicro PDU wiring, and I double/triple checked every pin because one mistake can destroy thousands of dollars in drives. I also covered airflow, drive temps (I saw up to ~44°C before tweaks), and power draw—about ~330W steady-state at the wall, roughly 8.25W per drive for the whole shelf. Finally, I break down cost: about $7,901 for ~720TB (under $11/TB) and why shopping for the chassis and parts matters more than people think.