BenchReady — USB Devices Disabled: accessory and hub isolation MacBook Air (M1, 2020), Apple M1 chip · 2.0.0 Determine whether the warning follows an accessory, a port or a hub power arrangement. MODEL FIT Choose Apple menu → About This Mac. Confirm MacBook Air (M1, 2020) and Chip: Apple M1. An Intel processor or another chip does not match. macOS Big Sur or later; Ventura and later call the preferences app System Settings. Diagnostic screens vary by macOS. Excluded: MacBook Air Intel 2020; MacBook Air M2; MacBook Pro M1 PREPARATION [ ] Only owned, trusted USB equipment is involved [ ] Any accessible external storage is safely ejected before disconnection [ ] Affected accessory [ ] Hub’s documented power supply if it is self-powered [ ] Keep any existing backup accessible to you. [ ] Keep credentials and personal files outside this record. GUIDE 1. Record whether the warning involves storage, an input device or another peripheral, and whether it was direct or through a hub. Stop transfers before changing the connection. Sources: https://support.apple.com/en-us/102204; Opening: external devices and power messages; original worksheet 2. Safely disconnect and reconnect the accessory. If it is storage and cannot be ejected safely, pause and ask for support instead of unplugging during activity. Sources: https://support.apple.com/en-us/102204; Troubleshooting → disconnect and reconnect; conservative data-preservation limit 3. Compare the accessory directly on the Mac, using only its documented adapter if required. Keep other nonessential USB accessories disconnected for a clear result. Sources: https://support.apple.com/en-us/102204; Troubleshooting → connect directly instead of hub 4. Compare the same direct accessory on the other USB-C port without changing its cable. If no compatible direct path is available, leave this row Not tested. Sources: https://support.apple.com/en-us/102204 | https://support.apple.com/en-us/111883; Troubleshooting → different port; Charging and Expansion 5. For a self-powered hub, verify its specified AC supply is connected. Compare the powered hub path only after recording the direct result; persistent warnings go to Apple or the accessory vendor. Sources: https://support.apple.com/en-us/102204; Troubleshooting → self-powered hub / contact Apple EVIDENCE TO RECORD Accessory category: Not recorded Hub power arrangement: Not recorded Warning follows: Not recorded First direct USB-C port — Same accessory/cable, no hub: Not checked Other direct USB-C port — Same accessory/cable, no hub: Not checked Documented powered hub — Same accessory with hub’s specified supply connected: Not checked STOP CONDITIONS Stop using and charging equipment with swelling, casing separation, smoke, a burning smell or suspected battery damage. Do not open or press on it. Set damaged accessories aside. Do not open mains adapters or force connectors. Do not erase, reset, flash firmware or bypass a lock as a default diagnostic step. OUTCOMES USB connection condition saved: Keep the path and power arrangement that worked. - Record direct-port results and hub power state. - Repeat only if the warning returns under the same safe conditions. Take the hub result to its vendor: The accessory worked directly but the documented hub path did not. - Provide hub model and its power supply details privately. - Include the direct baseline and remaining hub warning. Request a USB accessory review: The available direct comparisons still fail. This result cannot identify a replaceable Mac port. - Bring accessory, cable and direct-port results to Apple or its vendor. - Flag storage involvement and any unverified backup before repair. Preserve the missing comparison: Safe removal or a compatible direct connection is not available. - Finish file activity and verify a safe removal path first. - Ask the accessory vendor to confirm the supported direct adapter. Keep the unanswered checks visible: The direct path, safe-removal state or hub power requirement is still unknown. - Identify accessory category and original direct/hub path. - Provide the safe-removal limitation and tested ports without device contents. - Keep unperformed conditions marked Not tested. Ask the provider to confirm these before further changes. Stop the powered checks: Stop using or charging damaged equipment. Keep away from hot or smoking equipment; obtain emergency help for an immediate fire risk. Arrange manufacturer guidance before handling or transport. - Tell Apple about the visible damage before arranging a MacBook Air service. - Identify accessory category and original direct/hub path. - Do not open the case, remove the battery, press a lifted surface, or continue a test to complete this record. SOURCES USB Devices Disabled on Mac: https://support.apple.com/en-us/102204 (Troubleshooting list; checked 2026-10-13) MacBook Air (M1, 2020) technical specifications: https://support.apple.com/en-us/111883 (Charging and Expansion / Display Support; checked 2026-10-13) Important safety information for your Mac: https://support.apple.com/guide/macbook-air/important-safety-information-apd9b8f7aa11/mac (Handling / Built-in battery / Charging; checked 2026-10-13) Identify MacBook Air model: https://support.apple.com/en-ie/102869 (Find model / MacBook Air M1 2020; checked 2026-10-04) Use Apple Diagnostics to test your Mac: https://support.apple.com/en-gb/102550 (Prepare / Apple silicon / Run Apple Diagnostics / Results; checked 2026-10-13) External display dark or low resolution: https://support.apple.com/en-gb/102501 (Connections / Support limits / Detection / Accessory permission; checked 2026-10-13) This is a blank guide. Use the website to save observations and export an importable record. No physical repair has been verified.