july 17 tle chs class
Post on 03-Oct-2015
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1. What do you understand about storage devices? What do they do?
2. Have you ever use secondary storage devices before? If yes, can you mention the devices that you use.
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STORAGE DRIVES / MEDIA
referred to as:
storage, storage media, storage medium.
is a hardware device capable of
holding information.
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Primary storage is the storage provided by memory in a
computer system e.g. ROM/RAM.
Secondary storage
is storage provided by peripheral devices other than memory
TYPES OF COMPUTER
STORAGE DEVICES
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Secondary storage: is required in a computer system for three reasons.
1. The content of memory is usually volatile, which means that if power is disconnected the data is lost.
2. The capacity in megabytes of memory is limited.
3. Memory is more expensive than secondary storage.
TYPES OF COMPUTER
STORAGE DEVICES
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TYPES OF COMPUTER
STORAGE DEVICES
Several types of disks may be used for Secondary storage.
Floppy disks Hard disks Optical disks (including CD-ROM, writeable CD, DVD External /portable Storage Devices
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STORAGE DEVICES
A floppy disk is a low capacity disk which may be removed from the computer.
Those holding a small amount of data (typically 1.44 Mb
And Super floppies known as ZIP disks (typically 100 Mb)
Data may be written to and read from a floppy. A small notch can be used to make the disk read-only
Floppy Disk Drive
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Floppy Disk Drive
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STORAGE DEVICES
A hard disk is a higher capacity medium, with up to hundreds of gigabytes.
They are usually non-removable, but removable hard disks are becoming more common.
They can be both read from and written to, and are the standard medium for storage on computer systems today.
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The storage capacity of a hard drive is measured in billions of bytes, or gigabytes (GB).
The speed of a hard drive is measured in revolutions per minute (RPM).
Multiple hard drives can be added to increase storage capacity.
STORAGE DEVICES
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http://www.bestbuy.com/site/Computers-Promotions/-Hard-Drives-Types-and-Capacity-Guide/ pcmcat244100050004.c?id=pcmcat244100050004
STORAGE DEVICES
What can
you store?
Digital Music (Hours)
Digital Photos (Files)
Digital Videos (Hours)
DVD Quality (Movies)
HD Videos (Hours)
Capacity
320 GB up to 5,000 up to 100,000 up to 320 up to 80 up to 80
750 GB up to 12,000 up to 240,000 up to 750 up to 180 up to 180
1.0 TB up to 16,600 up to 320,000 up to 1,000 up to 250 up to 250
2.0 TB up to 33,320 up to 640,000 up to 1,000 up to 500 up to 500
3.0 TB up to 49,980 up to 960,000 up to 3,000 up to 750 up to 750
Average file
size using
camera's
highest-
resolution
JPEG mode
Based on
typical
2- hour
movie
Based on
H.264
compression
at 6.7Mbps
bitrate
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uses lasers to read data on the optical media.
Three types of optical drives:
Compact Disc (CD),
Digital Versatile Disc (DVD) and
Blu-ray Disc (BD).
STORAGE DEVICES
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CD, DVD, and BD media can be
pre-recorded (read-only),
recordable (write once),
or re-writable (read and write multiple times).
STORAGE DEVICES
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Rotation speed and data transmission
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a.k.a. as a thumb drive
a removable storage device connects to a USB port. An external flash drive uses the same type of non-volatile memory chips as solid state drives and does not require power to maintain the data.
STORAGE DEVICES
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SUMMARY
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ASSESSMENT ASSESSMENT:
Name: ______________________Year & Section: _____________ Date: __________
USSAGE / FUNCTION EXAMPLES
DEFINITION CAPACITY / SPEED
STORAGE MEDIA
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