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How to do Fast and unattended setup of OS

Here I have an Idea for primary setup of a large lab quickly. Suppose you have to setup a lab where have more than twenty or thirty system but must setup it quickly. At that time if you don't have enough CD Rom drive or not enough OS installer CD then the task will take a long time. To save time at the same moment I like to prepare an unattendent operating system installation. Before this task I must check for presence of some requirement. Verify for unattended Installation: To perform an unattended installation from a CD-ROM, the following conditions must be met:The computer must support booting from a CD Rom The unattended answer file must be renamed to Winnt.sif and copied to a floppy disk so Setup can access it. So must need a floppy disk drive.The answer file must contain a valid [Data] section. This is explained later in this article. Before installation it has some conditions:

1> the installation is limited to a single partition.

2> you cannot specify third-party drivers during Setup Prepare For an Unattended Installation:

To prepare your computer for an unattended installation from a CD-ROM, I've followed these stepsFirst I've created a Folder in local drive & shared it. Then I create setup manager.I install Setup Manager by following these steps:I Open My Computer, and then open the SupportTools folder on the Windows XP CD-ROM.Double-click the DEPLOY.CAB file to open it On the Edit menu, click Select All.On the Edit menu, click Copy to Folder.Click Make New Folder. Type the name that you want for the Setup Manager folder, and then press ENTER. For example, type setup manager, and then press ENTER.Click Copy. Open the new folder that you created, and then double-click the setupmgr.exe file. The Windows

Setup Manager Wizard starts:

Then I Use Setup Manager to Create an Answer File.
I open the setup manager & go to create a new answer file.
Then I go to the unattended installation & windows version option.
I have selected the fully automated option & create an answer file.

If you want Windows Setup to delete all partitions on the hard disk and to create a new partition, you must include the Repartition command in the Winnt.sif file. Under [Unattended], insert a new line, and then type "Repartition=Yes"
If you omit this line, you are prompted for the installation partition.

Add a [Data] section with the following entries to the unattended answer file:
Unattended Install=Yes - Value must be set to "yes"
MSDos Initiated=No - Value must be set to "no" or Setup stops during the graphical portion of Setup

Auto Partition=1 - If the value is set to 1, the installation partition is automatically selected. If the value is set to 0 (zero) you are prompted for the installation partition during the text portion of Setup.
Save the unattended answer file as Winnt.sif on a floppy disk.
Insert the Windows CD-ROM into the CD-ROM drive, and then insert the floppy disk into the floppy disk drive.
Change the boot order in the CMOS so that the CD-ROM is first in the list.
Restart your computer. When Setup is started from the CD-ROM, the Winnt.sif file located on the floppy disk will be used to complete the unattended installation.

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