it is a personal choice. the biggest reason is to use the second partition to store your music, movies, pictures,data and such. this way if you have a problem with your operating system and have to reinstall you will not lose your data files.
I have been doing for years what sobeit has suggested and it works well - for me. But there are a few things to keep in mind.
1. You must specify when a file is saved that it is to go to the other drive. Windows and applications will not automatically do this for you.
2. Whenever you create more then one partition it is likely that one is going to end up being too small. There are no rules that work for everybody in every situation. You can of course resize the partitions but this carries a degree of risk - you could loose everything.
Many people prefer the simplicity of one partition.
But whatever you choose you MUST have a backup of important data. Most people don't think about this until it is too late.
The ability to run backups faster on the smaller sections.
System checks, such a virus checks, can be accomplished faster by not having to wait for the program to read through a huge partition.
For example if you only wanted to test your operating system partition of 50G, it will finish faster than if you had a 250G partition with the system and all of your data.
Of course all partitions must be tested, but they do not necessarily need to be done all at once.
A system with 2 partitions can be faster than with just one. The system and application files will be the most frequently accessed. If these are confined to a relatively small portion of the disk the drive head seek times will be smaller than if the files were spread over the entire disk. This would be most noticeable with very large disks.
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