---
title: IOPhysicalLength
framework: driverkit
role: symbol
role_heading: Type Alias
path: driverkit/iophysicallength
---

# IOPhysicalLength

A type that represents the length of a memory block.

## Declaration

```occ
typedef IOPhysicalLength64 IOPhysicalLength;
```

## See Also

### Addresses

- [IOVirtualAddress](driverkit/iovirtualaddress.md)
- [IOPhysicalAddress](driverkit/iophysicaladdress.md)
- [IOPhysicalAddress32](driverkit/iophysicaladdress32.md)
- [IOPhysicalAddress64](driverkit/iophysicaladdress64.md)
- [IOPhysicalLength32](driverkit/iophysicallength32.md)
- [IOPhysicalLength64](driverkit/iophysicallength64.md)
- [IOCacheMode](driverkit/iocachemode.md)