# SizeBytes

> The size of the read request, in bytes.

## Definition

* **Type:** Property
* **Namespace:** [Unity.IO.LowLevel.Unsafe](/engine/6000.6/script-reference/unity/io/lowlevel/unsafe.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
public readonly ulong SizeBytes { get; }
```

### Remarks

For [AsyncReadManager](/engine/6000.6/script-reference/unity/io/lowlevel/unsafe/asyncreadmanager.md) operations, the size reported by this metric corresponds to the value specified in the [ReadCommand.Size](/engine/6000.6/script-reference/unity/io/lowlevel/unsafe/readcommand/size.md) field.