The hard drive stores the Operating System. Like for example : Windows XP or Windows Vista or even Windows 7 without the hard drive your computer will not turn on.
A Compaq Pressario X1000 computer will run only as fast as the size of your hard drive will allow. Your internet connection also plays a role in how fast your computer will run, for instance, dial-up would run much slower than DLS.
The role of Random Access Memory (RAM) is to store information about a program when it is being used by the hard drive, so tha you can access the program faster.
The role of a disk drive is to store (write) and retrieve (read) digital information for a computer system. Storage may be either on magnetic disks (Hard Disk Drive - HDD), in semiconductors (Solid State Drives - SSD), or it may use a combination of magnetic disks and semiconductors (Hybrid Hard Disk Drive - HHDD). In all cases, data is retained even when power is removed (non-volatile). Disk drives are located in the Secondary Tier of storage, that is they are not directly accessible to the computer (Primary Tier) but are accessed through an interface such as SCSI, ATA, or USB
It boots up the system.
A computer soft wear tells the hard wear what to do.
Logic plays an important role in computer programming. It also plays a role in clear thinking, and scientific analysis.
Peripherals are external devices that are attached, either by a cable or wifi, to the computer. Examples of peripherals are a keyboard, monitor, mouse, printer, external hard drive, and so on, all of whom are attached externally to the computer's tower and motherboard.
it distributes the electrical curent to the different components of the PC such as DVD rom, external lights, , and the parallel ports where you hook the monitor and keyboards and mouse and of course to the hard drive.
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That depends on what is the major role of the hard drive you intend to install. If you are planning on using it as system drive you might want to test it before installing OS (check hard drive manufacture's website). Then you insert installation disk and follow instructions you will be given a chance to create partitions and format them. If you want to add it as backup disk or for storage, testing is recommended to. But you will have create partitions (if you need more than one) and format it.
Ram plays crucial role in the performance of a computer. They hold data and instructions currently in used. The larger the ram the quicker the computer.