---
title: isReadOnly
framework: virtualization
role: symbol
role_heading: Instance Property
path: virtualization/vzdiskblockdevicestoragedeviceattachment/isreadonly
---

# isReadOnly

A Boolean value that indicates whether this disk attachment is read-only; otherwise, if the file handle allows writes, the device can write data into it.

## Declaration

```swift
var isReadOnly: Bool { get }
```

## See Also

### Getting the block storage device details

- [fileHandle](virtualization/vzdiskblockdevicestoragedeviceattachment/filehandle.md)
- [synchronizationMode](virtualization/vzdiskblockdevicestoragedeviceattachment/synchronizationmode.md)