four partitions on window7

view full story

http://askubuntu.com – I've just made a bootable usb on windows7, and now I want to replace my windows7 with Ubuntu. When I choose the option replace windows 7 with Ubuntu, I need to select a drive. Since I have only one drive in my desktop, I must use it. But on my windows the drive is partitioned into a C and D drive (both 500GB). I put all my files on the D drive, so I can still use them in Ubuntu. My intention is to install Ubuntu on the c drive from windows, but when i click on advanced partitioning tool, I see that there are four partitions: sda1(ntfs): 14.7 GB, sda2(ntfs): 104.9 MB, sda3(ntfs): 492.7 GB, sd (HowTos)