---
title: _maxBlockNumber
framework: kernel
role: pseudoSymbol
path: kernel/ioblockstoragedriver/maxblocknumber
---

# _maxBlockNumber

## Declaration

```occ
UInt64 _maxBlockNumber;
```

## Overview

Overview The maximum allowable block number for the media, zero-based.

## See Also

### Instance Variables

- [_writeProtected](kernel/ioblockstoragedriver/writeprotected.md)
- [_removable](kernel/ioblockstoragedriver/removable.md)
- [_mediaType](kernel/ioblockstoragedriver/mediatype.md)
- [_mediaObject](kernel/ioblockstoragedriver/mediaobject.md)
- [_mediaBlockSize](kernel/ioblockstoragedriver/mediablocksize.md)
- [_maxWriteByteTransfer](kernel/ioblockstoragedriver/maxwritebytetransfer.md)
- [_maxReadByteTransfer](kernel/ioblockstoragedriver/maxreadbytetransfer.md)
- [_ejectable](kernel/ioblockstoragedriver/ejectable.md)