# EnableFastLaunch
When you enable Windows fast launch for a Windows AMI, images are pre-provisioned, using snapshots to launch instances up to 65% faster. To create the optimized Windows image, Amazon EC2 launches an instance and runs through Sysprep steps, rebooting as required. Then it creates a set of reserved snapshots that are used for subsequent launches. The reserved snapshots are automatically replenished as they are used, depending on your settings for launch frequency.
**Note**
You can only change these settings for Windows AMIs that you own or that have been shared with you.
## Request Parameters
The following parameters are for this specific action. For more information about required and optional parameters that are common to all actions, see [Common Query Parameters](CommonParameters.md).
**DryRun**
Checks whether you have the required permissions for the action, without actually making the request, and provides an error response. If you have the required permissions, the error response is `DryRunOperation`. Otherwise, it is `UnauthorizedOperation`.
Type: Boolean
Required: No
**ImageId**
Specify the ID of the image for which to enable Windows fast launch.
Type: String
Required: Yes
**LaunchTemplate**
The launch template to use when launching Windows instances from pre-provisioned snapshots. Launch template parameters can include either the name or ID of the launch template, but not both.
Type: [FastLaunchLaunchTemplateSpecificationRequest](API_FastLaunchLaunchTemplateSpecificationRequest.md) object
Required: No
**MaxParallelLaunches**
The maximum number of instances that Amazon EC2 can launch at the same time to create pre-provisioned snapshots for Windows fast launch. Value must be `6` or greater.
Type: Integer
Required: No
**ResourceType**
The type of resource to use for pre-provisioning the AMI for Windows fast launch. Supported values include: `snapshot`, which is the default value.
Type: String
Required: No
**SnapshotConfiguration**
Configuration settings for creating and managing the snapshots that are used for pre-provisioning the AMI for Windows fast launch. The associated `ResourceType` must be `snapshot`.
Type: [FastLaunchSnapshotConfigurationRequest](API_FastLaunchSnapshotConfigurationRequest.md) object
Required: No
## Response Elements
The following elements are returned by the service.
**imageId**
The image ID that identifies the AMI for which Windows fast launch was enabled.
Type: String
**launchTemplate**
The launch template that is used when launching Windows instances from pre-provisioned snapshots.
Type: [FastLaunchLaunchTemplateSpecificationResponse](API_FastLaunchLaunchTemplateSpecificationResponse.md) object
**maxParallelLaunches**
The maximum number of instances that Amazon EC2 can launch at the same time to create pre-provisioned snapshots for Windows fast launch.
Type: Integer
**ownerId**
The owner ID for the AMI for which Windows fast launch was enabled.
Type: String
**requestId**
The ID of the request.
Type: String
**resourceType**
The type of resource that was defined for pre-provisioning the AMI for Windows fast launch.
Type: String
Valid Values: `snapshot`
**snapshotConfiguration**
Settings to create and manage the pre-provisioned snapshots that Amazon EC2 uses for faster launches from the Windows AMI. This property is returned when the associated `resourceType` is `snapshot`.
Type: [FastLaunchSnapshotConfigurationResponse](API_FastLaunchSnapshotConfigurationResponse.md) object
**state**
The current state of Windows fast launch for the specified AMI.
Type: String
Valid Values: `enabling | enabling-failed | enabled | enabled-failed | disabling | disabling-failed`
**stateTransitionReason**
The reason that the state changed for Windows fast launch for the AMI.
Type: String
**stateTransitionTime**
The time that the state changed for Windows fast launch for the AMI.
Type: Timestamp
## Errors
For information about the errors that are common to all actions, see [Common client error codes](errors-overview.md#CommonErrors).
## See Also
For more information about using this API in one of the language-specific AWS SDKs, see the following:
+ [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/ec2-2016-11-15/EnableFastLaunch)
+ [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/ec2-2016-11-15/EnableFastLaunch)
+ [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/ec2-2016-11-15/EnableFastLaunch)
+ [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/ec2-2016-11-15/EnableFastLaunch)
+ [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/ec2-2016-11-15/EnableFastLaunch)
+ [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/ec2-2016-11-15/EnableFastLaunch)
+ [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/ec2-2016-11-15/EnableFastLaunch)
+ [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/ec2-2016-11-15/EnableFastLaunch)
+ [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/ec2-2016-11-15/EnableFastLaunch)
+ [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/ec2-2016-11-15/EnableFastLaunch)