Such a feature greatly improves disk performance. Two major factors that impacts computer performance related to the hard disk drive are how the file is/files are scattered across the hard drive (known as fragmenting) and the location on the drive. However, reformatting a hard drive deletes all files on a computer, including the harmful ones, and returns the system to peak performance. The moral of this story is that fragmentation is a good and necessary thing. The hard disk performance directly affects everything else on the computer and is therefore the weakest link. This can affect your computer's overall speed, since the computer's pretty much just waiting on data while those platters spin, regardless of the speed of the computer… To keep your PC’s hard drive working at maximum efficiency, it should be regularly defragmented. The only disk based factor (along with actual drive performance) that would affect performance is how much fragmented your drive is. Using a faster disk, such as an SSD, will typically give you better read and write performance compared to an older HDD, but how does this affect PC gaming? Some SATA II and later hard disk drives support staggered spin-up, allowing the computer to spin up the drives in sequence to reduce load on the power supply when booting. When you load a compressed file, the CPU has to do more work decompressing it. The faster the platters of hard disk spin, the less time the hard drive will take to pull upon a certain data. However, that compressed file is smaller on the disk, so your computer can load the compressed data from disk faster. [45] Most hard disk drives today support some form of power management which uses a number of specific power modes that save energy by reducing performance. I use an utility called "WinContig". On a computer with a fast CPU but a slow hard drive, reading a compressed file might actually be faster. 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