In fact the opposite is true. It's good to split up the program and its data.

In a perfect world, the operating system would be on its own drive, all programs would be on a different drive, and the data used by programs on a third drive. Not only would that maximize efficiency (a little, admittedly) but it would make it easier to back up the data.

Also, we're pretty close to being rid of hard drive thrashing (when you run out of free space on the drive) and hard drive jumping (assuming you mean the movement of the hard drive read/write head in and out and to other platters). All these problems are improved by using SSDs. The only related problem that remains is you must keep around 20% free space on an SSD.



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