partition manager...

["Prateek Narang" <narang.prateek@xxxxxxxxxxxxxxx>]

hi! all,

i've 20gb harddisk and have two partition on that one is primary dos
partition and other one is extended dos partition. and the extended dos
partition has three logical partitions . now i want to install linux, and
want to know that is it necessary to have the non dos partition to install
the linux and if yes then how can i do it without loosing my data. one of my
friend told me that i can do it with the help of partition managers. which
partition manager should i use ? any url will help. i'm searching on net but
can't figure out which one should i use.