Storage Devices:
Storage holds data, instructions, and information for future use.
For Example:
.... .. computer can store hundreds or million of customer names and addresses. Storage hold these items permanently.
A Computer keep data, instructions, and information on storage mede.
Example,:
Storage media are USB flash drive
Hard disk or optimal diskand memory cards.
A USB Flash Drive is a protable storage device that is small and light weight enough to be transported on a keychain or in a pocket.
The average USB flash drive can hold about 4 Billion Characters. You plug a USB flash drive in a special , easily accessible opening on the computer.
A storage device records ( write) and /or retrieve ( reads) items to and from storage media.
Drives and readers/writers, which are type of storage devices.
For Example :
a DVD drive ( storage device)
Accepts as a DVD( storage media). Storage Devices often function as a source of input because they transfer ITEM from a storage to memory.
A hard disk provides mu greater storage capacity than a USB flash drive. The average hard disk hold more than 320 Billion Characters. Hard disks are enclosed in a airtight, sealed case. Although some are portable , most are housed inside the System Unit.
Portable hard disk are either external or removable. An External hard disk os a separate, free standing unit, whereas you insert and remove a removable hard disk from the computer or a device connected to the computer.
An optical disk is a flat, round, portable metal disk with a plastic coating.
CDs, DVDs, and BLue-ray Discs, are three types of optical discs. A CD can hold from 650 Billion to 1 Billion Characters.
Some DVDs can store two Full-length movies or 17 Billion Characters ,
Blue ray dics can store about 46 hours of standard video, or 100 Billion Characters.
Some mobile devices such as digital camera, use memory cards as the storage media.
..you can use a card reader/ writer to transfer the stored items, such as digital photos, from the memory card to a computer or printer.
Communication Devices:
A communication device is a hardware component that enables to send ( transmit) and receive data, instructions, and information to and from one or more computers or mobile devices.
A widely used communications devices is a "Modem".
Communications occur over cables, telephone line's, cellular radio networks, satellites, and other transmission media.
Some transmission media, such as satellites and cellular radio networks, are wireless, which means they har no physical line's or wire's.
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