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CHS (Cylinder-Head-Sector) Address

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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

<a name="CHS"></a>

CHS

Kind: global class

<a name="new_CHS_new"></a>

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

Cylinder-Head-Sector Address

Params

<a name="CHS+cylinder"></a>

chS.cylinder : <code>Number</code>

Cylinder

Kind: instance property of <code>CHS</code>

<a name="CHS+head"></a>

chS.head : <code>Number</code>

Head

Kind: instance property of <code>CHS</code>

<a name="CHS+sector"></a>

chS.sector : <code>Number</code>

Sector

Kind: instance property of <code>CHS</code>

<a name="CHS+buffer"></a>

chS.buffer : <code>Buffer</code>

Get/set values from/to a Buffer

Kind: instance property of <code>CHS</code>

<a name="CHS+setLBA"></a>

chS.setLBA(lba, hpt, spt) ⇒ <code>CHS</code>

Set CHS to a Logical Block Address (LBA)

Kind: instance method of <code>CHS</code>
Params

<a name="CHS+getLBA"></a>

chS.getLBA(hpt, spt) ⇒ <code>Number</code>

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

Kind: instance method of <code>CHS</code>
Returns: <code>Number</code> - lba
Params

<a name="CHS+toLBA"></a>

chS.toLBA(hpt, spt) ⇒ <code>Number</code>

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

<a name="CHS+clone"></a>

chS.clone() ⇒ <code>CHS</code>

Clone the CHS Address

Kind: instance method of <code>CHS</code>

<a name="CHS+copy"></a>

chS.copy(target) ⇒ <code>CHS</code>

Copy this address to a target address

Kind: instance method of <code>CHS</code>
Params

<a name="CHS+parse"></a>

chS.parse(buffer, [offset]) ⇒ <code>CHS</code>

Parse a given Buffer

Kind: instance method of <code>CHS</code>
Params

<a name="CHS+write"></a>

chS.write(buffer, [offset]) ⇒ <code>Buffer</code>

Write the CHS address to a given buffer

Kind: instance method of <code>CHS</code>
Params

<a name="CHS+toBuffer"></a>

chS.toBuffer() ⇒ <code>Buffer</code>

Create a Buffer representation of the CHS Address

Kind: instance method of <code>CHS</code>

<a name="CHS+fromNumber"></a>

chS.fromNumber(value) ⇒ <code>CHS</code>

Set the CHS address from its 24bit integer value

Kind: instance method of <code>CHS</code>
Params

<a name="CHS+toNumber"></a>

chS.toNumber() ⇒ <code>Number</code>

Get the 24bit integer value of the CHS address

Kind: instance method of <code>CHS</code>

<a name="CHS.fromBuffer"></a>

CHS.fromBuffer(buffer, [offset]) ⇒ <code>CHS</code>

Create a CHS Address from a given buffer

Kind: static method of <code>CHS</code>
Params

<a name="CHS.fromLBA"></a>

CHS.fromLBA(lba, hpt, spt) ⇒ <code>CHS</code>

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

Kind: static method of <code>CHS</code>
Params