vga hardisk
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8/6/2019 VGA HARDISK
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VGA
This is circuit board
that plug into the
computer
internally
internally &
connects to themonitor.
Its function is to
create the
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PERFORMANCE
CHARACTERISTICS
Available resolution. Number of colour per pixels.
Video memory the card needto maintain the image inmemory.
speed in carring out a variety of different graphic functions.
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LIQUID CRYSTAL
DISPLAYSThe screen
contains a layer
of liquid crystal
cells.
These have
unusual property
of hanging the
polarization of
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CR T(crystal relay tube)
The electronic are produce byan electron gun & other
components allow the beam tobe deflected left and right & up
and down.
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The processes used to
produce a display with
liquid crystals is as
follows.
a fluorescent panel generates light behind the
display panel
the light is filtered through a polariser.
Varying electrical charges are applied to
selected cells as required by the image,the
molecules in these liquid crystals cells
change shape and force the light to twist
(change polarisation)
the light emerging then passes through one of
three colour filters. Red,Blue, or Green that
are arranged close to each other.
The final colour displayed on the LCD monitor
depends upon the amount of twist of the light as
it passed through each of the filters.
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+$5'',6.
Is one of secondary Storage
device(non-volatile),medium and as therepository for a user's documents, filesand applications.
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Hard disks are rigid
platters, composedof a substrate and a
magnetic medium. The
substrate - theplatter's base
material - must be
non-magnetic andcapable of being
machined to a smooth
finish. It is made
CONSTRUCTION
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FILE SYSTEM
The precise manner in which data is organized on a hard disk drive is determined by the file
system used. File systems are generally operating system dependent. However, since it is the
most widely used PC operating system, most other operating systems' file systems are at leastread-compatible with Microsoft Windows.
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The FAT file system was first introduced in
the days of MS-DOS way back in 1981. Thepurpose of the File Allocation Table is to
provide the mapping between clusters - the
basic unit of logical storage on a disk at the
operating system level - and the physical
location of data in terms of cylinders, tracksand sectors - the form of addressing used
by the drive's hardware controller.
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The FAT contains an
entry for every file
stored on the volume
that contains the
address of the file's
starting cluster. Eachcluster contains a
pointer to the next
cluster in the file, or an
end-of-file indicator at
(0x FFFF), which indicates
that this cluster is the
end of the file. The
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The FAT contains an
entry for every file
stored on the volume
that contains the
address of the file's
starting cluster. Eachcluster contains a
pointer to the next
cluster in the file, or an
end-of-file indicator at
(0x FFFF), which indicates
that this cluster is the
end of the file. The
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FAT16, FAT32 and NTFS
each use differentcluster sizes
depending on the size
of the volume, and
each file system has a
maximum number of
clusters it can
support. The smaller
the cluster size, the
more efficiently a disk
stores information
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The table below
provides a comparison
of volume and defaultcluster sizes for the
different Windows file
systems still
commonly in use:
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