---
title: IOByteCount64
framework: driverkit
role: symbol
role_heading: Type Alias
path: driverkit/iobytecount64
---

# IOByteCount64

A type that represents a number of bytes in a 64-bit address space.

## Declaration

```occ
typedef uint64_t IOByteCount64;
```

## See Also

### Byte Counts

- [IOByteCount](driverkit/iobytecount.md)
- [IOByteCount32](driverkit/iobytecount32.md)