This section of the memory is also referred to as backup storage.
The storage capacity of primary storage is not sufficient to store the large volume so secondary storage.
Secondary storage also know as external memory or auxiliary storage not directly accessible by the CPU.
Storage devices
This lesson includes the following sections:
Categorizing Storage Devices
Magnetic Storage Devices
Optical Storage Devices
Storage devices hold data, even when the computer is turned off.
The physical material that actually holds data is called a storage medium. The surface of a floppy disk is a storage medium.
The hardware that writes data to or reads data from a storage medium is called a storage device. A floppy disk drive is a storage device.
The two primary storage technologies are magnetic and optical.
Diskettes (floppy disks)
Hard disks
High-capacity floppy disks
Disk cartridges
Magnetic tape
Compact Disk Read-Only Memory (CD-ROM) A magnetic disk's medium contains iron particles, which can be polarized—given a magnetic charge—in one of two directions.
Each particle's direction represents a 1 (on) or 0 (off), representing each bit of data that the CPU can recognize.
A disk drive uses read/write heads containing electromagnets to create magnetic charges on the medium.
Digital Video Disk Read-Only Memory
(DVD-ROM)
CD-Recordable (CD-R)
CD-Rewritable (CD-RW)
PhotoCD
This section of the memory is also referred to as backup storage.
The storage capacity of primary storage is not sufficient to store the large volume so secondary storage.
Secondary storage also know as external memory or auxiliary storage not directly accessible by the CPU.
Storage devices
This lesson includes the following sections:
Categorizing Storage Devices
Magnetic Storage Devices
Optical Storage Devices
Storage devices hold data, even when the computer is turned off.
The physical material that actually holds data is called a storage medium. The surface of a floppy disk is a storage medium.
The hardware that writes data to or reads data from a storage medium is called a storage device. A floppy disk drive is a storage device.
The two primary storage technologies are magnetic and optical.
Diskettes (floppy disks)
Hard disks
High-capacity floppy disks
Disk cartridges
Magnetic tape
Compact Disk Read-Only Memory (CD-ROM) A magnetic disk's medium contains iron particles, which can be polarized—given a magnetic charge—in one of two directions.
Each particle's direction represents a 1 (on) or 0 (off), representing each bit of data that the CPU can recognize.
A disk drive uses read/write heads containing electromagnets to create magnetic charges on the medium.
Digital Video Disk Read-Only Memory
(DVD-ROM)
CD-Recordable (CD-R)
CD-Rewritable (CD-RW)
PhotoCD
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2. Introduction Of Optical Data Storage
Optical storage is the storage of data on an optically readable
medium.
Data is recorded by making marks in a pattern that can be
read back with the aid of light, usually a beam of laser light
precisely focused on a spinning optical disc
An older example of optical storage that does not require the
use of computers, is microform.
There are other means of optically storing data and new
methods are in development.
4. TYPES OF STORAGE
Hard Disk Drive.
Solid State Storage.
Flash Memory.
Magnetic Storage.
Optical Storage Device like CD,DVD.
5. HARD DISK
A Hard Disk drive is a data storage device
used for storing and retrieving digital
Information using rapidly rotating disks.
An HDD consists of one or more rigid rapidly
rotating disks with magnetic heads arranged
on a moving actuator arm to read and write
data to the surfaces.
6. SOLID STATE DRIVE (SSD)
Data storage drive using Integrated circuit
assemblies as memory to storage
persistently.
SSD technology uses electronic interfaces
compatible with traditional block
input/output hard disk drives.
7. USB FLASH DRIVE
A USB flash refers to a type of computer
technology that stores data.
Flash memory is used in many different
appliances including memory card , PDAs.
8. COMPACT DISK
Compact Disk(CD) is a circular disk of diameter of 120 millimeters(4.7 inch)
9.
10. MAGNETIC STORAGE DEVICES
• How Magnetic Storage works
• Formatting
• Disk area
• Diskettes
• Hard disks
• Disk capacities
• Other Magnetic Storage Devices
11.
12.
13.
14.
15.
16. Optical Storage Devices
• They store data on the refractive surface of
the disc so that it can be read by a beam of
laser light.
• A laser uses concentrated ,narrow beam of
light directed by lens ,prisms and mirror.
• The tight focus is possible because all the
light is in same wavelength
17. • To store data ,the disk’s metal surface is covered
with tiny dents (pits) and flat spots (lands)
,which cause light to be reflected differently.
• When an optical drive shines light into the pit
,the light cannot be reflected .this represent bit
value ‘0’. A land reflects light back to source
which represent bit value ’1’.
How Optical Storage Works
18.
19. List of some Optical storage devices
CD-ROM
DVD-ROM
CD-R
CD-RW
photo CD
20. Other Optical Storage Devices
A CD-recordable drive lets to record your own
CD’s ,but data cannot be overwritten.
A CD-rewritable lets to record your own CD’s
and can be overwritten.
Photo CD technology is used to store digital
photographs.