Writing is the process of saving information to secondary storage devices. Reading is the process of accessing information from secondary storage devices.
Important characteristics of secondary storage include
- media-actual physical material that retains data and program
- capacity-how much a particular storage medium can hold
- storage devices-hardware that reads and writes to storage media
- access speed-time required to retrieve data from a secondary storage device
Hard disk
1. Internal hard disk
= internal hard disks are located within the system unit and typically identified as the c drive.
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2. External hard disk
= external hard disk are removable, external hard disk use the same basic technology as internal hard disks.
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Solid-state storage
solid-state storage devices have no moving parts and are more reliable and require less power than hard disks.
1. Flash memory
= flash memory cards are credit card-sized and widely used with notebook computers. They are used with a variety specialized input devices including
- digital cameras to store and transfer images
- digital media players like the iPod to store and transfer music and video files.
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2. USB drivers
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Optical discs
- compact disc
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- digital versatile disc
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- high-definition discs
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Others types
- internet hard drives
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- floppy disks
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- magnetic tape
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citation:
1. computing essential 2011
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