GNU/Linux uses a logical method for naming partitions. First, when numbering the partitions, it ignores the filesystem types of each partition that you may have. Second, it names the partitions according to the disk on which they are located. This is how the disks are named:
the primary master and primary slave IDE devices (whether they be hard disks, CDROM drives or anything else) are called /dev/hda and /dev/hdb respectively;
on the secondary interface, they are called /dev/hdc and /dev/hdd for the master and slave respectively;
if your computer contains other IDE interfaces (for example, the IDE interface present in some SoundBlaster cards), the disks will then be called /dev/hde, /dev/hdf, etc.
SCSI disks are called /dev/sda, /dev/sdb, etc., in the order of their appearance on the SCSI chain (depending on the increasing IDs). The SCSI CDROM drives are called /dev/scd0, /dev/scd1, always in the order of their appearance on the SCSI chain.
The partitions are named after the disk on which they are found, in the following way (in the example, we have used the case of partitions on a primary master IDE disk):
the primary (or extended) partitions are named /dev/hda1 through /dev/hda4 when present;
logical partitions, if any, are named /dev/hda5, /dev/hda6, etc. in their order of appearance in the table of logical partitions.
So GNU/Linux will name the partitions as follows:
So now you can cite the name the various partitions and hard disks when you need to manipulate them. You will also see that GNU/Linux names the partitions even if it does not know how to manage them initially (it ignores the fact that they are not native GNU/Linux partitions).