---
title: unknownWritingSpeed
framework: avfoundation
role: symbol
role_heading: Type Property
path: avfoundation/avexternalstoragedevice/reasonnotrecommendedforcaptureuse/unknownwritingspeed
---

# unknownWritingSpeed

## Declaration

```swift
static let unknownWritingSpeed: AVExternalStorageDevice.ReasonNotRecommendedForCaptureUse
```

## Discussion

Discussion Indicates that the storage device is not recommended for capture as its writing speed is unknown.

## See Also

### Reasons

- [encrypted](avfoundation/avexternalstoragedevice/reasonnotrecommendedforcaptureuse/encrypted.md)
- [slowWritingSpeed](avfoundation/avexternalstoragedevice/reasonnotrecommendedforcaptureuse/slowwritingspeed.md)
- [unsupportedFileSystem](avfoundation/avexternalstoragedevice/reasonnotrecommendedforcaptureuse/unsupportedfilesystem.md)