You plug in an external drive, hub or device, and your MacBook throws up a red-flagged warning: "USB Accessories Disabled — Unplug the accessory using too much power to re-enable USB devices." Suddenly your ports go dead and, worse, the drive you needed won't mount. It's a common and frustrating error — sometimes a simple fix, sometimes a sign of a deeper hardware problem. This guide walks through 8 proven solutions for 2026, and how to protect your data if a drive is the accessory involved.
From the engineers at CBL Data Recovery Singapore, who see plenty of "won't mount" drives that started with exactly this message.
What the error actually means
macOS shows this warning when a connected accessory draws — or appears to draw — more power than the port can safely supply. To protect the Mac, macOS cuts power to the USB port. The trigger might be genuinely too much power draw (a bus-powered drive on a daisy-chained hub), but it's just as often a faulty cable, a failing hub, a software glitch, or a hardware fault in the accessory or the Mac's port. Knowing that helps you work through the fixes in the right order — from harmless to hardware.
8 solutions to fix "USB Accessories Disabled"
1. Unplug everything and reconnect one device. Disconnect all USB accessories, wait a moment, then plug in just the one you need directly into the Mac. Daisy-chained hubs and multiple bus-powered devices are the most common trigger — connecting one device directly often clears it instantly.
2. Try a different cable and port. A worn or cheap cable is a leading cause. Swap to a known-good, high-quality cable, and try each of the Mac's ports. If it works on one port or cable and not another, you've found the culprit.
3. Use a powered USB hub. If your accessory legitimately needs more power than the port provides (some portable drives, especially older or 2.5" ones), a powered hub with its own adapter supplies external power and eliminates the draw problem entirely.
4. Restart your MacBook. A simple restart clears transient software glitches that can wrongly trigger the warning. It sounds basic, but it resolves a surprising share of cases.
5. Reset the SMC (Intel Macs) or restart (Apple Silicon). On Intel MacBooks, resetting the System Management Controller — which governs power management — often fixes phantom power warnings. On Apple Silicon Macs, a full shutdown-and-restart accomplishes the equivalent.
6. Update macOS. Some versions of macOS have had bugs that caused false "USB Accessories Disabled" warnings. Check for and install macOS updates, which often include fixes for USB power management.
7. Test the accessory on another computer. Plug the drive or device into a different Mac or a PC. If it fails everywhere, the accessory (or its enclosure) is likely at fault; if it works elsewhere, the issue is with your Mac's port or software.
8. Check for physical or liquid damage. If none of the above works, inspect the port and the accessory for bent pins, debris, or signs of liquid damage. A damaged port or a failing drive enclosure can trigger this error — and that points to hardware, not settings.
If the accessory is a hard drive with important data
This is where the error becomes more than an annoyance. If the "accessory using too much power" is an external hard drive and it now won't mount, be careful — the message can indicate the drive is drawing abnormal power because it's failing. In that case, repeated plugging and unplugging can worsen the damage.
- Don't keep re-plugging a drive that clicks, buzzes or spins up oddly. Those sounds plus this error strongly suggest a mechanical or electronic fault.
- Try a powered hub or a different computer once to distinguish a power/cable issue from a drive fault — but if it still won't mount and the data matters, stop.
- Never format or "initialise" the drive if macOS offers to — that can destroy recoverable data.
If an external drive triggers "USB Accessories Disabled" and won't mount, especially with unusual noises, treat it as a potential drive failure rather than a settings problem. Continued attempts can reduce what's recoverable. See our external hard drive recovery and Mac data recovery services.
How to avoid the error in future
A few habits prevent most recurrences:
- Use quality cables and, for power-hungry drives, powered hubs. Cheap cables and over-loaded bus-powered chains are the usual triggers.
- Don't daisy-chain multiple bus-powered devices off one port. Give demanding drives a direct or externally-powered connection.
- Keep macOS updated so you're not caught by a known USB bug.
- Eject drives safely and inspect connectors for wear and debris periodically.
- Back up external drives. If a drive ever does fail behind this error, a backup turns a crisis into a shrug. See our data backup tactics.
When to call a lab
If the error is tied to a drive that won't mount and holds irreplaceable data, or the drive makes unusual noises, a lab is the safe path. Labs can reach the data without relying on the failing power path, and can work around the enclosure or drive electronics that trigger the warning.
CBL's cleanroom lab recovers data from failed and unrecognised external drives — free diagnosis, fixed quote before any work.
- WhatsApp: +65 8127 7508
- Call: +65 6588 0261
A quick troubleshooting checklist
When the error appears, work through this order — it goes from harmless to hardware, so you rule out the easy causes before suspecting a fault:
- Unplug all USB devices, then connect only the one you need, directly to the Mac.
- Swap the cable for a known-good one, and try a different port.
- Try a powered USB hub if the device is a power-hungry drive.
- Restart the Mac (and reset the SMC on Intel models).
- Update macOS to rule out a known USB bug.
- Test the accessory on another computer to isolate whether it's the device or the Mac.
- Inspect for damage — bent pins, debris, or liquid in the port or connector.
- If it's a drive that won't mount and holds important data, stop and treat it as a possible drive failure rather than a settings issue.
Most cases are solved by steps 1–3 — a cable, a hub, or simply not overloading a single port. The value of the ordered approach is that if you do reach a drive that won't mount, you haven't made things worse by repeatedly forcing a failing device to power up. That restraint is often the difference between a straightforward recovery and a lost cause.