gpt

GPT - GUID Partition Table

Install via npm

$ npm install --save gpt

What can I do with this?

• Format disks / images
• Fix a partition table, recover a deleted partition
• Recover the GUID Partition Table from its backup
• Locate partitions which are inaccessible / ignored by the OS
• Verify the integrity of the primary GPT against its backup

Usage

var GPT = require( 'gpt' )

// Parse a buffer read from disk
var gpt = GPT.parse( buffer, options )

// Or, create a new one
var gpt = new GPT({
  // The block size of the device
  // the GPT will be written to
  // (optional, defaults to 512)
  blockSize: 512,
  // Header size in bytes
  // (min. 92, defaults to 92)
  headerSize: 92,
  // LBA of current GPT copy
  currentLBA: 1,
  // LBA of backup GPT
  backupLBA: 123456,
  // LBA of first "user-space" block
  firstLBA: 34,
  // LBA of last "user-space" block
  lastLBA: 556789,
  // LBA of partition table
  // (defaults to 2)
  tableOffset: 2,
  // Number of partition entries
  // (min. 128, defaults to 128)
  entries: 128,
  // Size of partition entry in bytes
  // (defaults to 128)
  entrySize: 128,
})

// Get the buffers
var buffer = gpt.toBuffer()
var headerBuffer = gpt.toBuffer( true, false )
var tableBuffer = gpt.toBuffer( false, true )

// Verify against a backup GPT
gpt.verify( backupGPT )