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Adding swap partition after system installation

I have total 4 drives.

The primary one is of type ext3 (ubuntu with 20GB free) and other 3 partitions are NTFS format/mount(with 20GB free) installation.

I installed without swap space because i didn't know how to create it.

How can I assign swap space after installation without damaging my old data. and can I use that swap space at emergency time? Plz help me. Thanks. :)

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marked as duplicate by Tom Brossman, Mitch, stephenmyall, SirCharlo, Eliah Kagan Oct 5 '12 at 15:35

This question was marked as an exact duplicate of an existing question.

up vote 0 down vote accepted

You should take a look at this : How to add a swap file. By creating this swap file, you shouldn't damage your existing data

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Please include details from the link. The community frowns upon link-only answers. – hexafraction Oct 5 '12 at 11:24

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