---
title: volumeSupportsZeroRuns
framework: foundation
role: symbol
role_heading: Instance Property
path: foundation/urlresourcevalues/volumesupportszeroruns
---

# volumeSupportsZeroRuns

A Boolean value that indicates whether the volume keeps track of allocated but unwritten parts of a file so that it can substitute zeroes without actually writing zeroes to the media.

## Declaration

```swift
var volumeSupportsZeroRuns: Bool? { get }
```

## Discussion

Discussion For security reasons, parts of a file that were never written to appear to contain zeroes.

## See Also

### Volume support values

- [isMountTrigger](foundation/urlresourcevalues/ismounttrigger.md)
- [isVolume](foundation/urlresourcevalues/isvolume.md)
- [volume](foundation/urlresourcevalues/volume.md)
- [volumeCreationDate](foundation/urlresourcevalues/volumecreationdate.md)
- [volumeIdentifier](foundation/urlresourcevalues/volumeidentifier.md)
- [volumeLocalizedFormatDescription](foundation/urlresourcevalues/volumelocalizedformatdescription.md)
- [volumeLocalizedName](foundation/urlresourcevalues/volumelocalizedname.md)
- [volumeMaximumFileSize](foundation/urlresourcevalues/volumemaximumfilesize.md)
- [volumeName](foundation/urlresourcevalues/volumename.md)
- [volumeResourceCount](foundation/urlresourcevalues/volumeresourcecount.md)
- [volumeSupportsAccessPermissions](foundation/urlresourcevalues/volumesupportsaccesspermissions.md)
- [volumeSupportsAdvisoryFileLocking](foundation/urlresourcevalues/volumesupportsadvisoryfilelocking.md)
- [volumeSupportsCasePreservedNames](foundation/urlresourcevalues/volumesupportscasepreservednames.md)
- [volumeSupportsCaseSensitiveNames](foundation/urlresourcevalues/volumesupportscasesensitivenames.md)
- [volumeSupportsCompression](foundation/urlresourcevalues/volumesupportscompression.md)