Chapter 8. Secondary Storage
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Alternatively referred to as external memory and auxiliary storage,secondary storage is a storage medium that holds information until it is deleted or overwritten regardless if the computer has power. For example, a floppy disk drive and hard disk drive are both good examples of secondary storage devices. RAM is primary storage. Differences between primary and secondary storage is most RAMs are loses its contents whenever power is disrupted. And it is called volatile. Secondary storage is not volatile, it is called nonvolatile storage because secondary storage is retain data and information even if computer is turned off.
In addition, we can talk about three widely used storage media: hard disk, optical disc, and solid-state storage. A hard disk is part of a unit, often called a "disk drive," "hard drive," or "hard disk drive," that stores and provides relatively quick access to large amounts of data on an electromagnetically charged surface or set of surfaces. Today's computers typically come with a hard disk that contains several billion bytes (gigabytes) of storage. Optical discs use laser technology. For example compact discs (CDs), digital versatile discs (DVDs), and Blu-ray Discs (high-definition). Solid-state storage devices don't have moving parts and more reliable and require less power than hard disks. For example; flash memory cards and USB drives (flash drives).
Finally, although off-line storage could be considered secondary storage, we've separated these into their own category because this media can be easily removed from the computer and stored elsewhere.
CAREERS IN IT
Software engineers analyze users' needs and create application software. Salary range is from $63,000 to $98,500.
A LOOK TO THE FUTURE
Your Entire Life Recorded on a Single Disk...
Imagine if you could store every conversation you ever had on a single disk. What if you could capture your entire life on video stored on just a few disks?...
"In the future, the electron state of atoms in a molecule will hold information at a much greater density..."
In addition, we can talk about three widely used storage media: hard disk, optical disc, and solid-state storage. A hard disk is part of a unit, often called a "disk drive," "hard drive," or "hard disk drive," that stores and provides relatively quick access to large amounts of data on an electromagnetically charged surface or set of surfaces. Today's computers typically come with a hard disk that contains several billion bytes (gigabytes) of storage. Optical discs use laser technology. For example compact discs (CDs), digital versatile discs (DVDs), and Blu-ray Discs (high-definition). Solid-state storage devices don't have moving parts and more reliable and require less power than hard disks. For example; flash memory cards and USB drives (flash drives).
Finally, although off-line storage could be considered secondary storage, we've separated these into their own category because this media can be easily removed from the computer and stored elsewhere.
CAREERS IN IT
Software engineers analyze users' needs and create application software. Salary range is from $63,000 to $98,500.
A LOOK TO THE FUTURE
Your Entire Life Recorded on a Single Disk...
Imagine if you could store every conversation you ever had on a single disk. What if you could capture your entire life on video stored on just a few disks?...
"In the future, the electron state of atoms in a molecule will hold information at a much greater density..."