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Is there a way that I can use my Linux ext4 file system, as such and then use it on some other computer.

I have a dual-boot of Windows 7 and Ubuntu 10.04 and my partition table looks like this:

My partition table

My question might not be clear, so explaining it with an example.

Can I copy my Linux partition on a flash drive and then use it on a different PC, with or without any need to install Ubuntu on new PC, by simply booting from the copied ext4 partition.
This way, I can easily port my Ubuntu packages and other applications, settings etc. from one PC to other.

If it's a very stupid question, please don't mind.

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...why did you post the table as a picture? – grawity Mar 18 '11 at 16:22
up vote 2 down vote accepted
  1. The simplest way is to create an empty partition of exactly the same size1, then cp or dd over the data.

    dd if=INPUT of=OUTPUT

    Pick one. For example, if you were to copy from /dev/sda3 to /dev/sdc1, you would use pv /dev/sda3 > /dev/sdc1 or dd if=/dev/sda3 of=/dev/sdc1.

    (You can copy into a regular file too, but it wouldn't be easily bootable, although you can loop-mount such a copy in an already-running system.)

  2. To make the copy bootable, you will need to install a bootloader into the flash drive.

    grub would work, but I'm not sure if the latest version supports specifying the root partition by UUID. (It used to be an Ubuntu-specific patch.) UUIDs are needed because grub needs a filesystem identifier that stays the same among computers.

1 The partition and the filesystem store their sizes independently; therefore, the partition must be as big as the filesystem thinks it is. You can create a larger partition and later grow the copied filesystem, though. Most filesystems can be shrunk too.

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Thanks. However, making the copy bootable and how the partition and filesystem store their sizes independently, is quite unclear. Can you guide me through a tutorial or an article which explains this. – Jatin Ganhotra Mar 19 '11 at 4:19

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