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I am going to install CentOS 5.6 by bootable dvd and I arrive at the Installation Method stage that forces me to choose one item to identify CentOS packages. My CentOS iso file exists on my hard drive and I dont know which one to choose?

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I don't understand the question. Can you word it more clearly? Try using short sentences, with punctuation. –  Gilles Jul 3 '11 at 19:22
    
+1 Substantive first question from a newbie. –  Charles Stewart Dec 19 '11 at 9:04

2 Answers 2

If i understand you correctly, installation method depends on the source of the system you will install. In general, your choice is between local (from the CD/DVD/USB that you've inserted or from NFS share in your network) and remote (ftp, http). Just choose "DVD/CD-ROM " as method and follow the prompts. This has nothing to do with coexistence with Windows.

Stage, where you decide on coexistence is partitioning. You have to make sure to retain your current NTFS partition, so don't choose 'automatically remove all partitions on disk'. And don't remove it manually. Installer will automatically find that you have second OS in later stages and give you option to boot either CentOS or Windows from the boot manager (GRUB)

Also, take a look at the Installation Guide. It may be a great help for you.

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Don't move your NTFS partition either, since it is really important to Windows that C:\, which contains the \System directory, is the first partition. –  Charles Stewart Dec 19 '11 at 8:32

Consider nuking your Windows partition, after archiving all of its content, and reinstalling Windows as a virtual machine. I've had fairly good experiences doing this with Windows 7 on Xen on Debian Squeeze (stable; I confess that the Win7 on Parallels on OSX is much nicer to use, but that is likely not an option given your stated hardware). I see the Xen wiki has a writeup for HowToXenWindowsOnCentOS5, for WinXP. For either, you need to do a little configuration of the Windows guest OS:

  1. http://www.virtuatopia.com/index.php/Installing_and_Running_Windows_7_as_a_Xen_HVM_domainU_Guest for Win7; or
  2. http://www.virtuatopia.com/index.php/Installing_and_Running_Windows_XP_or_Vista_as_a_Xen_HVM_domainU_Guest for WinXP.

A particularly nice thing about virtualisation is that sharing filesystems becomes painless: Xen will mount your Linux filesystems as drives on your Windows guest, so that you can use the same home directory for both Linux and Windows. And you can install Windows from an ISO image file, rather than needing physical media.

If you must go the separate-boot on separate-partitions route, the process I recommend goes so:

  1. Archive your Windows drive; you will nuke existing partitions with this installation;
  2. Start installing your preferred flavour of Linux;
  3. Choose GRUB as your boot loader;
  4. Make the first partition large enough for Windows and complete installation of Linux to your second partition. Oh, and it is probably good to have a third Linux rescue partition. Consider also having a FAT32 partition for painless-to-get-going sharing between Linux and Windows;
  5. Format your first partition to be NTFS. You might not need to do this, since the Windows installation usually is able to do this itself, but sometimes it won't, and sometimes it is not respectful of other partitions;
  6. Install Windows.
  7. Tell GRUB about Windows.

Several of these steps might give you trouble: feel free to come back and ask for help if they do.

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