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loop, used to mount loopback devices, such as the swap partition, if you are using a journalised filesystem [ default is yes on most distros ] then yes loop is very usefull to have running.
loop itself allows non root users to mount such devices, since swap is mounted automatically without it.
If you do not want non root users to mount loopback filesystems / devices then you do not need it.
the simplest way to remove this from starting is to use sysvinit in a gui, find loop on the list of services for your default runlevel and drag it to the halt section for that runlevel.
if you want, you can drag it to the trash can in sysv for all runlevels instead, then use the save in the file menu to make these changes permanent.
you do have to be root to do this, or else have used su to start sysv.
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