A PC's main memory place (or primary storage) is fast storage space that is directly
accessible by the CPU. It is generally used for storing relatively short-term data needed for software
execution. Main memory is usually much faster than mass storage devices like hard disks or optical
discs, but usually cannot retain data for more than a few fractions of a second without power and is
more expensive. Therefore, it is not generally suitable for long-term or archival data storage. As
with the CPU, most PCs use some form of semiconductor random access memory such as DRAM
or SRAM as their primary storage.
Hard disk drive
The disk drives use a sealed head/disk assembly (HDA) which was first introduced by
IBM's "Winchester" disk system. The use of a sealed assembly allowed the use of positive air
pressure to drive out particles from the surface of the disk, which improves reliability.
If the mass storage controller provides for expandability, a PC may also be upgraded by the addition
of extra hard disk or optical drives. For example, DVD-ROMs, CD-ROMs, and various optical disc
recorders may all be added by the user to certain PCs. Standard internal storage device interfaces
are ATA, Serial ATA, SCSI, and CF+ Type II in 2005.
Graphics - Video card
The graphics card - otherwise called a graphics adapter, video adapter, or video card - processes and
renders the graphics output from the computer to the VDU or computer monitor and is an essential
part of the modern computer. On older and budget models graphics cards tended to be integrated
with the motherboard but, more commonly, they are supplied in PCI, AGP, or PCI Express format.
Graphic cards are also the most glamorized computer component as it is the component which
creates all the visual effects on the computer which is essential for playing games.
accessible by the CPU. It is generally used for storing relatively short-term data needed for software
execution. Main memory is usually much faster than mass storage devices like hard disks or optical
discs, but usually cannot retain data for more than a few fractions of a second without power and is
more expensive. Therefore, it is not generally suitable for long-term or archival data storage. As
with the CPU, most PCs use some form of semiconductor random access memory such as DRAM
or SRAM as their primary storage.
Hard disk drive
The disk drives use a sealed head/disk assembly (HDA) which was first introduced by
IBM's "Winchester" disk system. The use of a sealed assembly allowed the use of positive air
pressure to drive out particles from the surface of the disk, which improves reliability.
If the mass storage controller provides for expandability, a PC may also be upgraded by the addition
of extra hard disk or optical drives. For example, DVD-ROMs, CD-ROMs, and various optical disc
recorders may all be added by the user to certain PCs. Standard internal storage device interfaces
are ATA, Serial ATA, SCSI, and CF+ Type II in 2005.
Graphics - Video card
The graphics card - otherwise called a graphics adapter, video adapter, or video card - processes and
renders the graphics output from the computer to the VDU or computer monitor and is an essential
part of the modern computer. On older and budget models graphics cards tended to be integrated
with the motherboard but, more commonly, they are supplied in PCI, AGP, or PCI Express format.
Graphic cards are also the most glamorized computer component as it is the component which
creates all the visual effects on the computer which is essential for playing games.
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