A PCIe-to-5-port SATA card gives ZimaBoard more SATA data ports, but it does not power the hard drives. Four or five 3.5-inch HDDs need a separate, properly sized 5V/12V power source that can handle simultaneous spin-up current.
The 2024 source thread correctly separated these two jobs but drifted toward improvised ATX jumpers. For a clean build, use a powered drive cage/backplane, a properly enclosed ATX/SFX PSU with a normal starter board/switch, or a purpose-built multi-drive enclosure instead of exposed wiring.
The PCIe Card Carries Data Only
Each SATA HDD still needs a SATA power connector. The controller's PCIe slot does not provide drive motor power through the SATA data ports.
Why Four HDDs Need More Power Than Their Idle Rating
3.5-inch disks draw their highest power during spin-up. Size the supply from each drive model's startup-current specification, not just average watts.
Clean Option 1: Powered Drive Backplane
A multi-bay cage or backplane can distribute SATA power cleanly and keep connectors mechanically supported. Pair it with the PCIe SATA controller for data.
Clean Option 2: SFX/ATX PSU with a Proper Starter
A PC PSU can power multiple drives safely when used inside a proper enclosure. Do not leave exposed mains terminals or manually short wires as a permanent installation.
Clean Option 3: Powered DAS
A multi-bay DAS handles drive power, cooling, and mechanical mounting. Current ZimaOS supports USB storage, although a USB bridge adds its own reliability considerations.
Do Not Power Five Drives from the Original Two-Drive Harness
The original ZimaBoard power design centers on a small two-drive setup. Splitting the existing SATA power connector repeatedly creates voltage-drop, connector-current, and startup-load risks.
The current ZimaBoard hardware interface guide documents the board's dual SATA and PCIe expansion interfaces; it does not turn the PCIe controller into a drive-power source.
Choose a Reliable SATA Controller
For RAID or important data, prefer a controller chipset with stable Linux support and independent disk presentation. Avoid port-multiplier designs when predictable disk identity matters.
The multi-drive NAS guide provides the same design principle for larger storage builds.
Cooling Matters Too
Five 3.5-inch HDDs need directed airflow. Test drive temperatures during sustained writes or RAID rebuilds, not only at idle.
Calculate a Real Power Budget
For each HDD, note the vendor's 12V and 5V startup-current figures. Multiply by the number of drives that can spin simultaneously, then add margin for the controller, fans, and any other load on the same PSU.
Total wattage alone can hide a rail limit. A PSU may advertise enough combined watts while its 12V or 5V output is inadequate for the actual drive mix.
Avoid Cheap SATA Power Splitter Chains
Long splitter chains concentrate current through a small number of connectors and wires. Poor-quality molded SATA power adapters are especially undesirable in a multi-drive NAS because a high-resistance connection can heat under sustained load.
A proper backplane or PSU harness distributes power more cleanly and makes drive replacement easier.
Coordinate Drive Power and ZimaBoard Power
If the drives use a separate PSU from the ZimaBoard, make sure both supplies start in a predictable way. The storage controller should not repeatedly see drives appear and disappear because one PSU comes up much later than the other.
For a permanent enclosure, use a proper shared power switch/trigger design rather than manually shorting ATX pins each time.
Test Under the Worst Storage Workload
After wiring the system, test a cold boot with all drives attached and then a sustained multi-disk write or RAID rebuild. Watch for drive resets, SATA link errors, or unexpected reboots. A system that only survives idle is not a validated NAS power design.
FAQ
Can the PCIe SATA card power the drives?
No. It provides SATA data connectivity. The disks need a separate SATA power source.
Can I use a desktop ATX PSU?
Yes, but use it as a properly enclosed PSU with a safe starter/switch solution and enough capacity for spin-up load.
Is a Pico PSU enough?
Only if its 5V/12V outputs and connectors are rated for the exact simultaneous drive load. Do not judge by total wattage alone.
What is the cleanest five-drive build?
A powered multi-bay cage/backplane or enclosure is cleaner and safer than loose splitters and exposed PSU wiring.
