packer-cn/website/pages/partials/builder/alicloud/ecs/AlicloudDiskDevices-not-required.mdx

<!-- Code generated from the comments of the AlicloudDiskDevices struct in builder/alicloud/ecs/image_config.go; DO NOT EDIT MANUALLY -->

- `system_disk_mapping` (AlicloudDiskDevice) - Image disk mapping for the system disk.
  See the [disk device configuration](#disk-devices-configuration) section
  for more information on options.
  Usage example:
  
  ```json
  "builders": [{
    "type":"alicloud-ecs",
    "system_disk_mapping": {
      "disk_size": 50,
      "disk_name": "mydisk"
    },
    ...
  }
  ```

- `image_disk_mappings` ([]AlicloudDiskDevice) - Add one or more data disks to the image.
  See the [disk device configuration](#disk-devices-configuration) section
  for more information on options.
  Usage example:
  
  ```json
   "builders": [{
     "type":"alicloud-ecs",
     "image_disk_mappings": [
       {
         "disk_snapshot_id": "someid",
         "disk_device": "dev/xvdb"
       }
     ],
     ...
   }
   ```