{
  "id": "mba-m1-usb-disabled",
  "version": "1.0.0",
  "title": "USB Devices Disabled response",
  "deviceFamily": "laptop",
  "modelId": "mba-m1",
  "modelApplicability": {
    "id": "mba-m1",
    "name": "MacBook Air M1",
    "family": "laptop",
    "revision": "MacBook Air (M1, 2020), Apple M1 chip",
    "os": "macOS Big Sur or later; Ventura and later call the preferences app System Settings. Diagnostic screens vary by macOS.",
    "region": "US-first; local repair provider requirements vary.",
    "help": "Choose Apple menu → About This Mac. Confirm MacBook Air (M1, 2020) and Chip: Apple M1. An Intel processor or another chip does not match.",
    "exclusions": [
      "MacBook Air Intel 2020",
      "MacBook Air M2",
      "MacBook Pro M1"
    ],
    "sourceIds": [
      "mac-id",
      "mac-spec",
      "mac-diagnostics"
    ]
  },
  "exclusions": [
    "MacBook Air Intel 2020",
    "MacBook Air M2",
    "MacBook Pro M1"
  ],
  "intent": "Isolate a hub power problem from one unrecognized USB accessory.",
  "category": "connections",
  "prerequisites": [
    "Only owned trusted accessories are used",
    "Storage devices are safely ejected before disconnecting"
  ],
  "tools": [
    "Affected USB accessory",
    "Its required power supply, if self-powered"
  ],
  "materials": [
    "A private place to keep your findings",
    "A current backup if the device is accessible"
  ],
  "checks": [
    {
      "id": "safety",
      "goal": "Separate unsafe hardware from routine preparation.",
      "question": "Any swelling, casing separation, liquid damage, smoke, burning smell, or damaged battery/adapter?",
      "sourceIds": [
        "mac-charge"
      ],
      "options": [
        {
          "id": "safe",
          "label": "No visible danger",
          "next": "check-1"
        },
        {
          "id": "danger",
          "label": "Yes, or suspected damage",
          "next": "stop"
        },
        {
          "id": "unknown",
          "label": "I cannot confirm",
          "next": "uncertain"
        }
      ]
    },
    {
      "id": "check-1",
      "goal": "Isolate hub power and connection.",
      "question": "Have you compared one device directly rather than through an unpowered hub?",
      "sourceIds": [
        "mac-usb"
      ],
      "options": [
        {
          "id": "yes",
          "label": "Yes",
          "next": "check-2"
        },
        {
          "id": "no",
          "label": "No",
          "next": "attention"
        },
        {
          "id": "unknown",
          "label": "Not checked / unsure",
          "next": "uncertain"
        }
      ]
    },
    {
      "id": "check-2",
      "goal": "Observe recognition.",
      "question": "Is the accessory recognized without the disabled-device alert?",
      "sourceIds": [
        "mac-usb"
      ],
      "options": [
        {
          "id": "yes",
          "label": "Recognized normally",
          "next": "ready"
        },
        {
          "id": "no",
          "label": "Alert or failure remains",
          "next": "service"
        },
        {
          "id": "unknown",
          "label": "Not checked / unsure",
          "next": "uncertain"
        }
      ]
    }
  ],
  "branches": [
    {
      "from": "safety",
      "answer": "safe",
      "to": "check-1"
    },
    {
      "from": "safety",
      "answer": "danger",
      "to": "stop"
    },
    {
      "from": "safety",
      "answer": "unknown",
      "to": "uncertain"
    },
    {
      "from": "check-1",
      "answer": "yes",
      "to": "check-2"
    },
    {
      "from": "check-1",
      "answer": "no",
      "to": "attention"
    },
    {
      "from": "check-1",
      "answer": "unknown",
      "to": "uncertain"
    },
    {
      "from": "check-2",
      "answer": "yes",
      "to": "ready"
    },
    {
      "from": "check-2",
      "answer": "no",
      "to": "service"
    },
    {
      "from": "check-2",
      "answer": "unknown",
      "to": "uncertain"
    }
  ],
  "steps": [
    {
      "id": "step-1",
      "text": "If the accessory is storage, eject it first if possible. Disconnect and reconnect the affected device without disturbing other active transfers.",
      "sourceIds": [
        "mac-usb"
      ],
      "locator": "USB Devices Disabled troubleshooting list"
    },
    {
      "id": "step-2",
      "text": "Try the accessory in the other Mac port. Keep whether the alert is port-specific in your notes.",
      "sourceIds": [
        "mac-usb"
      ],
      "locator": "USB Devices Disabled troubleshooting list"
    },
    {
      "id": "step-3",
      "text": "Remove a hub from the path and connect the device directly to the Mac with the correct cable.",
      "sourceIds": [
        "mac-usb"
      ],
      "locator": "USB Devices Disabled troubleshooting list"
    },
    {
      "id": "step-4",
      "text": "If the hub is self-powered, check its AC power connection. Compare one accessory at a time and contact Apple if the alert persists.",
      "sourceIds": [
        "mac-usb"
      ],
      "locator": "USB Devices Disabled troubleshooting list"
    }
  ],
  "outcomeChecks": [
    "Save the direct/hub comparison. This identifies a useful connection lead, not a confirmed port failure.",
    "Persistent alerts after these checks need Apple or accessory support. Do not open a hub or adapter."
  ],
  "stopConditions": [
    "Stop using and charging a swollen or damaged battery. Do not open, compress, puncture, or attempt battery removal. Contact the manufacturer or a qualified service provider.",
    "Disconnect a damaged accessory if it is safe to do so. Do not open a mains power adapter.",
    "Save accessible data before restarting. Do not reset, erase, flash firmware, bypass a lock, or open the enclosure in this task."
  ],
  "terminals": {
    "ready": {
      "type": "preparation_saved",
      "title": "Checks recorded",
      "text": "Save the direct/hub comparison. This identifies a useful connection lead, not a confirmed port failure."
    },
    "service": {
      "type": "service_needed",
      "title": "Arrange service or support",
      "text": "Persistent alerts after these checks need Apple or accessory support. Do not open a hub or adapter."
    },
    "attention": {
      "type": "maintenance_possible",
      "title": "Complete the preparation first",
      "text": "Review the relevant step above. Gather the missing item or perform the reversible check, then go back and update your answer. A missing prerequisite does not identify a failed part."
    },
    "uncertain": {
      "type": "preparation_saved",
      "title": "Save an incomplete preparation record",
      "text": "Your observation is still unknown. Save the unanswered checks and use the linked support instructions or a qualified provider to confirm the next step."
    },
    "stop": {
      "type": "service_needed",
      "title": "Stop and get professional help",
      "text": "Do not charge, use, open or press on a device with suspected battery damage. Do not handle hot or smoking equipment. Seek the manufacturer’s safety and service guidance; use local emergency services if there is an immediate fire risk."
    }
  },
  "sources": [
    {
      "id": "mac-usb",
      "title": "USB Devices Disabled on Mac",
      "url": "https://support.apple.com/en-us/102204",
      "locator": "Troubleshooting list",
      "purpose": "Direct connection, other port, powered hub",
      "checkedAt": "2026-10-04",
      "reuse": "Reference only. Original paraphrase; no copied images or manual pages.",
      "licenseStatus": "Public support document; no redistribution license assumed."
    },
    {
      "id": "mac-id",
      "title": "Identify MacBook Air model",
      "url": "https://support.apple.com/en-ie/102869",
      "locator": "Find model / MacBook Air M1 2020",
      "purpose": "Model and chip confirmation",
      "checkedAt": "2026-10-04",
      "reuse": "Reference only. Original paraphrase; no copied images or manual pages.",
      "licenseStatus": "Public support document; no redistribution license assumed."
    },
    {
      "id": "mac-spec",
      "title": "MacBook Air M1 2020 specifications",
      "url": "https://support.apple.com/en-us/111883",
      "locator": "Charging and Expansion / Display Support",
      "purpose": "USB-C charging, one native external display",
      "checkedAt": "2026-10-04",
      "reuse": "Reference only. Original paraphrase; no copied images or manual pages.",
      "licenseStatus": "Public support document; no redistribution license assumed."
    },
    {
      "id": "mac-diagnostics",
      "title": "Use Apple Diagnostics",
      "url": "https://support.apple.com/en-gb/102550",
      "locator": "Prepare / Apple silicon / Results",
      "purpose": "Startup options, Command-D and reference codes",
      "checkedAt": "2026-10-04",
      "reuse": "Reference only. Original paraphrase; no copied images or manual pages.",
      "licenseStatus": "Public support document; no redistribution license assumed."
    },
    {
      "id": "mac-charge",
      "title": "Mac battery will not charge",
      "url": "https://support.apple.com/en-gb/guide/mac-help/-mh29198/mac",
      "locator": "Check software / Check hardware",
      "purpose": "Cable, power, temperature and Apple silicon restart",
      "checkedAt": "2026-10-04",
      "reuse": "Reference only. Original paraphrase; no copied images or manual pages.",
      "licenseStatus": "Public support document; no redistribution license assumed."
    }
  ],
  "assets": [
    {
      "path": "/assets/decision-flow.svg",
      "kind": "Original schematic",
      "alt": "Model match, danger check, observation, then preparation or service"
    }
  ],
  "relatedIds": [
    "mba-m1-diagnostics",
    "mba-m1-usbc-charge",
    "mba-m1-safe-mode"
  ],
  "estimatedDuration": {
    "minutes": 15,
    "label": "Planning estimate; excludes charging, cooling, backups and service. Not a measured repair time."
  }
}