CHS (Cylinder-Head-Sector) Address

CHS addressing is an early method for giving addresses to each physical block of data on a hard disk drive, identifying individual sectors on a disk by their position in a track, where the track is determined by the head and cylinder numbers.

Install via npm

$ npm install --save chs

Usage

// Load module
var CHS = require( 'chs' )

// Create a CHS address
var addr = new CHS( 5, 20, 8 )

// Properties:
var c = addr.cylinder
var h = addr.head
var s = addr.sector

// Convert to an LBA (Logical Block Address)
var lba = addr.toLBA( headsPerTrack, sectorsPerTrack )
var lba = addr.toLBA( 12, 32 )

// Set it to an LBA
addr.setLBA( lba, headsPerTrack, sectorsPerTrack )
addr.setLBA( 3150, 16, 63 )

// Get it as a buffer
var buf = addr.buffer
var buf = addr.toBuffer()

// Set from buffer
addr.buffer = new Buffer([ 0xFE, 0xFF, 0xFF ])
addr.parse( new Buffer([ 0xFE, 0xFF, 0xFF ]) )

API Reference

CHS

Kind: global class

• CHS
  • new CHS([cylinder], [head], [sector])
  • instance
    • .cylinder : Number
    • .head : Number
    • .sector : Number
    • .buffer : Buffer
    • .setLBA(lba, hpt, spt) ⇒ CHS
    • .getLBA(hpt, spt) ⇒ Number
    • .toLBA(hpt, spt) ⇒ Number
    • .clone() ⇒ CHS
    • .copy(target) ⇒ CHS
    • .parse(buffer, [offset]) ⇒ CHS
    • .write(buffer, [offset]) ⇒ Buffer
    • .toBuffer() ⇒ Buffer
    • .fromNumber(value) ⇒ CHS
    • .toNumber() ⇒ Number
  • static
    • .fromBuffer(buffer, [offset]) ⇒ CHS
    • .fromLBA(lba, hpt, spt) ⇒ CHS

new CHS([cylinder], [head], [sector])

Cylinder-Head-Sector Address

Params

• [cylinder] Number | Buffer = 1023
• [head] Number = 254
• [sector] Number = 63

chS.cylinder : Number

Cylinder

Kind: instance property of CHS

chS.head : Number

Head

Kind: instance property of CHS

chS.sector : Number

Sector

Kind: instance property of CHS

chS.buffer : Buffer

Get/set values from/to a Buffer

Kind: instance property of CHS

chS.setLBA(lba, hpt, spt) ⇒ CHS

Set CHS to a Logical Block Address (LBA)

Kind: instance method of CHS
Params

• lba Number - Logical Block Address
• hpt Number - Heads per Track
• spt Number - Sectors per Track

chS.getLBA(hpt, spt) ⇒ Number

Get the Logical Block Address (LBA) corresponding to the given disk geometry

Kind: instance method of CHS
Returns: Number - lba
Params

• hpt Number - Heads per Track
• spt Number - Sectors per Track

chS.toLBA(hpt, spt) ⇒ Number

Kind: instance method of CHS
Returns: Number - lba
See: #getLBA()
Params

• hpt Number - Heads per Track
• spt Number - Sectors per Track

chS.clone() ⇒ CHS

Clone the CHS Address

Kind: instance method of CHS

chS.copy(target) ⇒ CHS

Copy this address to a target address

Kind: instance method of CHS
Params

• target CHS

chS.parse(buffer, [offset]) ⇒ CHS

Parse a given Buffer

Kind: instance method of CHS
Params

• buffer Buffer
• [offset] Number = 0

chS.write(buffer, [offset]) ⇒ Buffer

Write the CHS address to a given buffer

Kind: instance method of CHS
Params

• buffer Buffer
• [offset] Number = 0

chS.toBuffer() ⇒ Buffer

Create a Buffer representation of the CHS Address

Kind: instance method of CHS

chS.fromNumber(value) ⇒ CHS

Set the CHS address from its 24bit integer value

Kind: instance method of CHS
Params

• value Number

chS.toNumber() ⇒ Number

Get the 24bit integer value of the CHS address

Kind: instance method of CHS

CHS.fromBuffer(buffer, [offset]) ⇒ CHS

Create a CHS Address from a given buffer

Kind: static method of CHS
Params

• buffer Buffer
• [offset] Number = 0

CHS.fromLBA(lba, hpt, spt) ⇒ CHS

Create a CHS Address from a Logical Block Address (LBA)

Kind: static method of CHS
Params

• lba Number - Logical Block Address
• hpt Number - Heads per Track
• spt Number - Sectors per Track