---
title: VZDiskImageSynchronizationMode.fsync
framework: virtualization
role: symbol
role_heading: Case
path: virtualization/vzdiskimagesynchronizationmode/fsync
---

# VZDiskImageSynchronizationMode.fsync

Synchronizes data to the drive using the system’s best-effort synchronization mode.

## Declaration

```swift
case fsync
```

## Discussion

Discussion This mode synchronizes the data with the drive, but doesn’t ensure the data moves from the disk’s internal cache to permanent storage. This is a best-effort mode with the same guarantees as the fsync(_:) system call.

## See Also

### Disk image synchronization modes

- [VZDiskImageSynchronizationMode.full](virtualization/vzdiskimagesynchronizationmode/full.md)
- [VZDiskImageSynchronizationMode.none](virtualization/vzdiskimagesynchronizationmode/none.md)