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FAT32 File System

FAT12/16/32 file system driver

Install via npm

$ npm install --save fat32

Features

• Reading volume boot & information sector
• Reading of clusters and cluster chains
• Write support
• Node fs compatible API
• Defragmentation
• Transactions (if multiple FATs are present)

Usage

Related Modules

• ExFAT - ExFAT file system driver
• NTFS - NTFS file system driver
• HFS+ - HFS+ file system driver
• Ext4 - Ext4, Ext3, Ext2 file system driver
• MBR - Master Boot Record (MBR)
• GPT - GUID Partition Table (GPT)
• BlockDevice - Reads from & writes to block devices, or treats files as block devices
• Disk - Handles a formatted block device (reads the MBR and GPT, creates bounded partitions with BlockDevice APIs)

Mounting a partition from a block device

var BlockDevice = require( 'blockdevice' )
var Disk = require( 'disk' )
var FAT = require( 'fat32' )

var device = new BlockDevice({
  path: '/dev/rdisk2', // or i.e. '\\\\.\\PhysicalDrive2' on Windows
})

var disk = new Disk( device )
var volume = new FAT.Volume()

disk.open(( error ) => {

  // For purposes of demonstration, error handling will
  // not be tended to in this example, but should of course
  // be implemented in real-world use cases
  if( error ) return handleError( error )

  // Find a FAT formatted partition
  var partNo = disk.mbr.partitions.findIndex(( partition ) => {
    return partition.type === 0x0B || partition.type === 0x0C
  })

  // Mount the partition (with a BlockDevice API)
  volume.mount( disk.partitions[ partNo ], null, ( error ) => {
    console.log( util.inspect( volume ) )
    // ...
    volume.unmount(( error ) => {
      disk.close(( error ) => {
        // ...
      })
    })
  })

})

Volume {
  device: Partition {
    device: BlockDevice {
      fd: 13,
      path: '/dev/rdisk2',
      mode: 'r',
      blockSize: 512,
      size: -1,
      headsPerTrack: -1,
      sectorsPerTrack: -1
    },
    firstLBA: 8192,
    lastLBA: 137216
  },
  bits: 32,
  readOnly: true,
  vbr: VBR {
    jmp: <Buffer eb 58 90>,
    oemName: 'mkfs.fat',
    sectorSize: 512,
    sectorsPerCluster: 1,
    reservedSectors: 32,
    numberOfFATs: 2,
    rootDirEntries: 0,
    sectorCount: 129024,
    mediaType: 248,
    sectorsPerFAT: 993,
    sectorsPerTrack: 32,
    numberOfHeads: 64,
    hiddenSectors: 0,
    fsType: 'FAT32   ',
    flags: 0,
    version: '0.0',
    rootClusterSector: 2,
    fsInfoSector: 1,
    mirrorSector: 6,
    reserved: <Buffer 00 00 00 00 00 00 00 00 00 00 00 00>,
    driveNumber: 128,
    corrupted: 0,
    extendedSignature: 41,
    id: 1892531337,
    name: 'boot       ',
    code: <Buffer 0e 1 f be 77 7 c ac 22 c0 74 0b 56 b4 0e bb 07 00 cd 10 5e eb f0 32 e4 cd 16 cd 19 eb fe 54 68 69 73 20 69 73 20 6e 6 f 74 20 61 20 62 6 f 6 f 74 61 62 6 c...>,
    signature: 43605,
    rootCluster: 2
  },
  info: FSInfo {
    reserved1: <Buffer 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00...>,
    freeClusters: 85480,
    lastCluster: 41530,
    reserved2: <Buffer 00 00 00 00 00 00 00 00 00 00 00 00>
  },
  tables: [{
    id: 268435448,
    eoc: 4279238655,
    buffer: <Buffer f8 ff ff 0 f ff ff ff 07 65 00 00 00 ac a0 00 00 05 00 00 00 06 00 00 00 07 00 00 00 08 00 00 00 09 00 00 00 0 a 00 00 00 0b 00 00 00 0 c 00 00 00 0 d 00...>
  }, {
    id: 268435448,
    eoc: 4279238655,
    buffer: <Buffer f8 ff ff 0 f ff ff ff 07 65 00 00 00 ac a0 00 00 05 00 00 00 06 00 00 00 07 00 00 00 08 00 00 00 09 00 00 00 0 a 00 00 00 0b 00 00 00 0 c 00 00 00 0 d 00...>
  }]
}

References

• Wikipedia / Design of the FAT file system