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# init(opening:)

Opens an existing disk image using the specified image URL.

```
convenience init(opening configuration: some OpenConfigurationProtocol) throws
```

## Parameters

`configuration`

The configuration object that specifies the parameters for opening the disk image.

## Discussion

Use this initializer to open any existing disk image — standalone or a disk image layer.
To append this image to a stacked disk image, use [`appending(_:)`](/documentation/DiskImageKit/DiskImage/appending(_:)-4wifj).
Encrypted disk images are not supported.

The following example demonstrates opening a disk image using a URL.

```
let image = try DiskImage(opening: .open(url: imageURL))
```

> Throws: ``doc://com.apple.diskimagekit/documentation/DiskImageKit/CorruptedImageError`` if the disk image contains invalid data.
> ``doc://com.apple.diskimagekit/documentation/DiskImageKit/UnsupportedFormatError`` if the disk image format isn’t supported.
> `POSIXError` for file system errors such as file not found or permission denied.

---

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