ISO documents

ISO The document is actually Compact disc Of Image file , Recording software You can directly ISO Burn files to installable System Compact disc ,ISO The documents are usually in the form of iso Extension name , Its File format by iso9660.

ISO 9660, It is also called by some hardware and software suppliers CDFS（Compact Disk File System, CD file system ）, It's a by International Organization for Standardization （ISO） A file system published for optical media . The goal is to be able to operate on different operating systems , Such as Windows,Mac OS And classes Linux Exchange data on the system .

history

ISO 9660 From the High Sierra file system .High Sierra By using a Layered trees （ There are eight floors in total ） file system , In a dense 、 Sequential layout to organize file information , Be similar to UNIX and FAT. To enhance cross platform compatibility , It defines a common file attribute （ Directory or original file and recording time ） And name attributes （ file name , Extension , edition ） The smallest collection of , And use a separate system area to be compatible with future extended properties .

High Sierra stay 1986 year 12 Moon cover Ecma The international use （ Some changes have been made ） It has become an international standard , namely ECMA-119, And submitted to the international organization for standardization to become ISO 9660:1988.ISO 9660 File systems are being widely used in the industry .

brief introduction

Most of what we download LINUX The installation files are iso Format , After downloading to the local, double clicking will be WINRAR open , Many people regard it as Compressed package , This is not true ,ISO Through some means, files can be directly extracted without decompressing Hard disk installation .

iso File and virtual optical drive

ISO The characteristics of the document ：1） At most 8 Level subdirectories （ It can be used RockRidge Extension Increase this limit ）

2） The maximum file name is 32 character

3） Generally, the file size does not exceed 650M, Actually, it can be based on CD or DVD Burn a disc Change in size

many Linux Operating system and some pirated products on the network Windows The installation packages of are all based on ISO In the form of a document . After getting the corresponding ISO After the document , Its contents can be burn （Burn） To Compact disc On . It's done like this Compact disc It is basically the same as the installation CD purchased .

Operation file

Linux Lower operation ISO file

stay Linux Next , With root You can execute commands in the following format from /path Read in directory xxx.iso What's in this file .

In actual use , It should be modified according to the actual situation /path and xxx.iso.

mount -t iso9660 -o loop xxx.iso /path

If you want to make ISO file , hold Compact disc Put it in CD drive in , Then execute the following copy command to copy the contents of the CD to a ISO In the document . In actual use , It should be modified according to the actual situation xxx.iso.

cp /dev/cdrom xxx.iso

System files

Windows Lower operation ISO file

stay windows Next , Generally, special tools and software are required to operate ISO file . such as UltraISO、WinISO、WinImage、Daemon Tools、WinMount etc. .( stay Windows8 Double click to run ）

If you just want to read ISO Contents of the file , You can use WinRAR.WinRAR3.0 All of the above versions support iso9660 File format . use WinRAR、WinISO or WinImage open ISO file , Select what you want , Just unzip it .

chart 1

however , stay Windows 8 And beyond Windows Operating system , You can select... From the right-click menu “ load ” command , Mount it to the virtual optical drive .

Under the installation disk

Linux Of the operating system installation disk ISO file

The red flag Linux4.1 Desktop version of iso The installation file is in Linux Hang to in environment /mnt/iso See the contents of .

If you take this iso The document is engraved into Compact disc , So the contents of the CD are the same .

It is worth noting that there are two directories . One is images, This directory contains some 1.44MB floppy disk Of Image file , among bootdisk.img It can be used to make a startup floppy disk for installation ; The other is dosutils, It contains some DOS Tools , such as rawrite.exe, Use this Software You can write the image file of the floppy disk to the floppy disk

How to make iso file ？

Use Jinshan to simulate the optical drive, etc Virtual CD-ROM Software Can be made ISO file .

Virtual CD-ROM It's a simulation （CD-ROM) Software tools that work , It can generate a virtual CD-ROM with the same kinetic energy as the CD-ROM installed on your computer , What a general CD-ROM drive can do is the same as a virtual CD-ROM drive , Its working principle is to virtual out one or more virtual optical drives first , take Compact disc Application software on , Mirror image On the hard disk , And generate a virtual optical drive Image file , And then you can do it in Windows95/98/NT Put the image file into the virtual optical drive for use , So when you want to start this Applications when , You don't have to put the CD in the CD-ROM drive , There is no need to wait for the CD-ROM drive to start slowly , Just tap on the Insert Icon , Virtual CD Immediately mount the virtual CD-ROM drive to run , Fast and convenient .

Virtual CD-ROM Characteristics and uses of

Virtual CD-ROM There are many functions that ordinary CD-ROM drives cannot achieve , For example, the runtime does not Compact disc , Even without an optical drive , Execute multiple discs at the same time Software , Fast processing power 、 Easy to carry, etc . Virtual CD-ROM It has the following characteristics and uses ：

（1）. High speed CD-ROM

Virtual CD-ROM Run directly on your hard disk , Speed up to 200X; Virtual CD-ROM drives react very fast , Play video files smoothly without stopping . The transmission speed of the general hard disk is 10-15MB/S about , The conversion CD drive transmission speed （150K/S） be equal to 100X. Nowadays, most mainboards are integrated Ultra DMA Hard disk controller , Its transmission speed can be as high as 33M/S(220X)

（2）. Notebook best friend

Virtual CD-ROM It can solve the problem that the notebook computer has no CD-ROM drive 、 Too slow 、 Not easy to carry 、 Optical drive power consumption and other problems ; Disc image It can be copied from other computers or networks .

（3）.MO The best choice

Virtual CD-ROM The generated Compact disc （ Virtual CD ） Can be deposited MO disc , Take it with you MO The disc becomes “ Compact disc MO”,MO CD-ROM drive in one , Kill two birds with one stone .

（4）. Copy Compact disc

Virtual CD-ROM Copy Compact disc Only one corresponding Virtual disc files , So it's very easy to manage ; Instead of copying hundreds of files from the CD to the hard disk , This method may not work correctly , Because many CDs Software Will ask to run on the CD-ROM drive , And deletion management is also a problem ; Virtual CD-ROM drives completely solve these problems .

（5）. Run multiple Compact disc

Virtual CD-ROM Can run multiple different discs at the same time Application software . for example , We can watch the Encyclopedia Britannica on a CD-ROM drive , At the same time, install with another CD-ROM drive “ Kingsoft PowerWord 2000”, Listen with a real CD-ROM drive CD Record . Such a request is made in one CD drive You can't do it anyway .

（6）. Compress

Virtual CD-ROM Generally, professional compression and instant decompression algorithms are used for some uncompressed files , compression ratio Can be up to 50% above ; Run time automatic instant decompression , The video playback effect will not be distorted .

（7）. Compact disc tower

Virtual CD-ROM Can completely replace expensive Compact disc tower , Direct access to unlimited discs at the same time , You don't have to wait for a change , Fast , Easy to use , No space and no hardware maintenance problems .

install Virtual CD-ROM After the performance

install Virtual CD-ROM After the system , Users can use Windows95/98/NT See one or more CD-ROM drive letters on the system platform , And every virtual CD-ROM drive is just like a real CD-ROM drive , Whether it's for use MS-DOS Pattern 、 still Explorer , Even in Control panel in , You will also see this drive letter , They are virtual optical drives just like real optical drives .

Operation method

Windows In the environment iso How to open

Recommendation tool ：ultraiso Pictured 2：iso Open as shown in Figure ：

chart 2：iso Open graph

Then we use the open menu under the open tool or file , Find what we want to open iso file ;

chart 3： find iso File map

iso After the file is opened , We can see its contents as shown in the figure 3：iso The contents of the document are shown in the figure  [1]  ：

chart 4：iso Document content diagram

from ：ISO file _ Baidu Encyclopedia