Why does Ubuntu need 2 swap partitions, can I remove one?

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http://askubuntu.com – I installed Ubuntu 11.10 - 32bit (with 40GB disk space) alongside windows7. Then, I installed a Ubuntu 11.10 - 64bit alongside windows, as the 32bit was installed by my mistake. I chose the recommended option of saving the files by upgrading Ubuntu but this procedure failed. When I tried to reboot, the system refused to reboot. Doing a clean install of 64bit ubuntu solved the problem. Now, everything is good and Ubuntu 64bit is installed alongside windows except that I seem to have lost some disk space. Looking at the disk utility, I see that there are 2 swap partitions: /dev/sda7 /dev/sd (HowTos)