Technically, a hard disk should contain either as many as four primary partitions, or one to three primaries along with a single extended partition. Each of these partitions are described by a 16-byte entry in the Partition Table which is located in the Master Boot Record.
Many poeple confused with Linux partitioning system when they are installing Linux for the first time. In linux they see hda1 then hda5 but they are familiar with C:, D: etc
your HDD can be recognize by hda, hdb,hdc,hdd, sda, sdb etc depending on the master, slave and cable position. Here i am describing with hda
generally a windows / most of the PC has this type of partition system.
here hda2 is the full extended partion and hda3 and hda4 are reserved as we can create 2 more primary partitions so extended partition start from hda5
Extended partition generally start from hda5
so if anyone want to install linux in his G: drive then he need to delete the hda8 then create 2 partitions
one swap space (it can be compare with windows virtual memory) ram * 2 (size recomanded) and another root / partition.
Note: I would suggest to create swap first then root / partition and at the last of the HDD sector more then or at least 8 MB free unallocated space. When user need to reinstall windows sometimes it creates problem, if there is no free unallocated space.