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# MTLStorageMode

Options for the memory location and access permissions for a resource.

```
enum MTLStorageMode
```

## Overview

For more guidance on how to choose storage modes, see [Setting resource storage modes](/documentation/Metal/setting-resource-storage-modes).

## Topics

### Storage mode options

[`MTLStorageMode.shared`](/documentation/Metal/MTLStorageMode/shared)

The CPU and GPU share access to the resource, allocated in system memory.

[`MTLStorageMode.managed`](/documentation/Metal/MTLStorageMode/managed)

The CPU and GPU may maintain separate copies of the resource, and any changes need to be explicitly synchronized.

[`MTLStorageMode.private`](/documentation/Metal/MTLStorageMode/private)

The resource is only available to the GPU.

[`MTLStorageMode.memoryless`](/documentation/Metal/MTLStorageMode/memoryless)

The resource’s contents are only available to the GPU, and only exist temporarily during a render pass.


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