---
title: numOfBlocks
framework: BlockStorageDeviceDriverKit
role: symbol
role_heading: Instance Property
platforms: [driverkit 21.0+]
path: blockstoragedevicedriverkit/blockrange/numofblocks
---

# numOfBlocks

The number of blocks in this range.

## Declaration

```occ
uint64_t numOfBlocks;
```

## See Also

### Accessing Block Range Properties

- [startBlock](blockstoragedevicedriverkit/blockrange/startblock.md)