|There are many reasons to use multiple partitions. |
IMHO the best reason is that separating different classes of files can make it much easier to maintain a current backup set of all files on your computer.
You don't want to know how many folks come here every week wanting to know how to recover their important files.
You should keep at least TWO copies of ANY files that are of any importance to you.
Now, to the partitions. If you have a separate partition for the operating system and you create a backup image of that partition you can restore that partition without having to restore or re-install any of the other data, prgrams, etc., on the computer.
That in itself should be reason enough to have at least TWO partitions.
To carry the same thought forward you probably don't add programs very often so that partition won't have constant changes. Imaging that partition would make it easier to restore in the event it should be necessary.
Now, the stuff that does change alot are your personal files. You pay cash to download a song and your computer crashes. There goes your song. If you have at least three partitions then you can image them at different intervals and still keep up to date backups.
This is in addition to the other advantages mentioned above.
Now to the practical side of things. Laptops come with the OS and usually a set of programs pre-installed. This can make it more difficult to setup the drive as I described above.
I don't use OEM computers so I don't have much experience with the different methods employed to load and restore the data on the drive. I am pretty sure you can still do what I described above with your system.
Look at the link below for some partitioning strategies.