---
title: uncached
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/nsdata/readingoptions/uncached
---

# uncached

A hint indicating the file should not be stored in the file-system caches.

## Declaration

```swift
static var uncached: NSData.ReadingOptions { get }
```

## Discussion

Discussion For data being read once and discarded, this option can improve performance.

## See Also

### Constants

- [mappedIfSafe](foundation/nsdata/readingoptions/mappedifsafe.md)
- [alwaysMapped](foundation/nsdata/readingoptions/alwaysmapped.md)