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- `delete_on_termination` (boolean) - Indicates whether the EBS volume is
deleted on instance termination. Default `false`. **NOTE**: If this
value is not explicitly set to `true` and volumes are not cleaned up by
an alternative method, additional volumes will accumulate after every
build.
- `device_name` (string) - The device name exposed to the instance (for
example, `/dev/sdh` or `xvdh`). Required for every device in the block
device mapping.
- `encrypted` (boolean) - Indicates whether or not to encrypt the volume.
By default, Packer will keep the encryption setting to what it was in
the source image. Setting `false` will result in an unencrypted device,
and `true` will result in an encrypted one.
- `iops` (number) - The number of I/O operations per second (IOPS) that
the volume supports. See the documentation on
[IOPs](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_EbsBlockDevice.html)
for more information