---
title: HFSPlusVolumeHeader
framework: Kernel
role: symbol
role_heading: Structure
platforms: [macOS 10.6+]
path: kernel/hfsplusvolumeheader
---

# HFSPlusVolumeHeader

## Declaration

```occ
typedef struct HFSPlusVolumeHeader {
    ...
} HFSPlusVolumeHeader;
```

## Topics

### Instance Properties

- [allocationFile](kernel/hfsplusvolumeheader/1578018-allocationfile.md)
- [attributes](kernel/hfsplusvolumeheader/1578161-attributes.md)
- [attributesFile](kernel/hfsplusvolumeheader/1577988-attributesfile.md)
- [backupDate](kernel/hfsplusvolumeheader/1577913-backupdate.md)
- [blockSize](kernel/hfsplusvolumeheader/1577972-blocksize.md)
- [catalogFile](kernel/hfsplusvolumeheader/1577980-catalogfile.md)
- [checkedDate](kernel/hfsplusvolumeheader/1578160-checkeddate.md)
- [createDate](kernel/hfsplusvolumeheader/1578062-createdate.md)
- [dataClumpSize](kernel/hfsplusvolumeheader/1577891-dataclumpsize.md)
- [encodingsBitmap](kernel/hfsplusvolumeheader/1578025-encodingsbitmap.md)
- [extentsFile](kernel/hfsplusvolumeheader/1577993-extentsfile.md)
- [fileCount](kernel/hfsplusvolumeheader/1578061-filecount.md)
- [finderInfo](kernel/hfsplusvolumeheader/1578078-finderinfo.md)
- [folderCount](kernel/hfsplusvolumeheader/1577961-foldercount.md)
- [freeBlocks](kernel/hfsplusvolumeheader/1578057-freeblocks.md)
- [journalInfoBlock](kernel/hfsplusvolumeheader/1578099-journalinfoblock.md)
- [lastMountedVersion](kernel/hfsplusvolumeheader/1578017-lastmountedversion.md)
- [modifyDate](kernel/hfsplusvolumeheader/1578080-modifydate.md)
- [nextAllocation](kernel/hfsplusvolumeheader/1577866-nextallocation.md)
- [nextCatalogID](kernel/hfsplusvolumeheader/1578041-nextcatalogid.md)
- [rsrcClumpSize](kernel/hfsplusvolumeheader/1577880-rsrcclumpsize.md)
- [signature](kernel/hfsplusvolumeheader/1577917-signature.md)
- [startupFile](kernel/hfsplusvolumeheader/1577919-startupfile.md)
- [totalBlocks](kernel/hfsplusvolumeheader/1577871-totalblocks.md)
- [version](kernel/hfsplusvolumeheader/1578030-version.md)
- [writeCount](kernel/hfsplusvolumeheader/1578118-writecount.md)

## See Also

### Format

- [HFSCatalogFile](kernel/hfscatalogfile.md)
- [HFSCatalogFolder](kernel/hfscatalogfolder.md)
- [HFSCatalogKey](kernel/hfscatalogkey.md)
- [HFSCatalogThread](kernel/hfscatalogthread.md)
- [HFSExtentDescriptor](kernel/hfsextentdescriptor.md)
- [HFSExtentKey](kernel/hfsextentkey.md)
- [HFSMasterDirectoryBlock](kernel/hfsmasterdirectoryblock.md)
- [HFSPlusAttrData](kernel/hfsplusattrdata.md)
- [HFSPlusAttrExtents](kernel/hfsplusattrextents.md)
- [HFSPlusAttrForkData](kernel/hfsplusattrforkdata.md)
- [HFSPlusAttrInlineData](kernel/hfsplusattrinlinedata.md)
- [HFSPlusAttrKey](kernel/hfsplusattrkey.md)
- [HFSPlusBSDInfo](kernel/hfsplusbsdinfo.md)
- [HFSPlusCatalogFile](kernel/hfspluscatalogfile.md)
- [HFSPlusCatalogFolder](kernel/hfspluscatalogfolder.md)
- [HFSPlusCatalogKey](kernel/hfspluscatalogkey.md)
- [HFSPlusCatalogThread](kernel/hfspluscatalogthread.md)
- [HFSPlusExtentDescriptor](kernel/hfsplusextentdescriptor.md)
- [HFSPlusExtentKey](kernel/hfsplusextentkey.md)
- [HFSPlusForkData](kernel/hfsplusforkdata.md)
- [HFSUniStr255](kernel/hfsunistr255.md)