---
title: SyncReadWrite
framework: kernel
role: symbol
role_heading: Instance Method
path: kernel/ioscsiblockcommandsdevice/1521998-syncreadwrite
---

# SyncReadWrite

## Declaration

```occ
virtual IOReturn SyncReadWrite(IOMemoryDescriptor *buffer, UInt64 startBlock, UInt64 blockCount, UInt64 blockSize);
```