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Portable media players
Computer hardware is the collection of physical elements that constitutes a computer system. Computer hardware refers to the physical parts or components of a computer such as the monitor, mouse, keyboard, computer data storage, hard drive disk (HDD), system unit (graphic cards, sound cards, memory, motherboard and chips), etc. all of which are physical objects that can be touched. In contrast, software is instructions that can be stored and run by hardware.
Software is any set of machine-readable instructions that directs a computer's processor to perform specific operations. A combination of hardware and software forms a usable computing system.
Digital audio players
Secure Digital (SD) is a non-volatile memory card format for use in portable devices, such as mobile phones, digital cameras, GPS navigation devices, and tablet computers.
The Secure Digital standard was introduced in 1999 as an evolutionary improvement over MultiMediaCards (MMC). The Secure Digital standard is maintained by the SD Card Association (SDA). SD technologies have been implemented in more than 400 brands across dozens of product categories and more than 8,000 models.
A mobile digital media player (M-DMP), portable media player (PMP), or digital audio player (DAP), is a portable digital consumer electronics device that is capable of storing and playing digital media which is electronic stored, such as audio, images, and video files, etc. and is primarily designed to be carried with you on your person during use. The data is digitized information typically stored on a flash memory, microdrive, or hard drive. In contrast, analog portable audio players play music from non-digital media such as cassette tapes, or records.
Often mobile digital audio players are marketed and sold as "portable MP3 players", even if they also support other file formats and media types. Other types of electronic devices which can also act as a like mobile digital media player, but only have those media playback features as a secondary function, are cellphones, internet tablets, and sometimes even digital cameras are referred as portable media players because of their playback capabilities. This article focuses on portable devices that have the main function of playing media.
A memory card or flash card is an electronic flash memory data storage device used for storing digital information. They are commonly used in many electronic devices, including digital cameras, mobile phones, laptop computers, MP3 players and video game consoles. They are small, re-recordable, and able to retain data without power.
Comparison of portable media players
The SanDisk Sansa is a line of 2 to 32 gigabyte flash memory-based portable media players produced by SanDisk.
The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite (TCP/IP) to serve several billion users worldwide. It is a network of networks that consists of millions of private, public, academic, business, and government networks, of local to global scope, that are linked by a broad array of electronic, wireless and optical networking technologies. The Internet carries an extensive range of information resources and services, such as the inter-linked hypertext documents of the World Wide Web (WWW), the infrastructure to support email, and peer-to-peer networks.
Most traditional communications media including telephone, music, film, and television are being reshaped or redefined by the Internet, giving birth to new services such as voice over Internet Protocol (VoIP) and Internet Protocol television (IPTV). Newspaper, book and other print publishing are adapting to website technology, or are reshaped into blogging and web feeds. The Internet has enabled and accelerated new forms of human interactions through instant messaging, Internet forums, and social networking. Online shopping has boomed both for major retail outlets and small artisans and traders. Business-to-business and financial services on the Internet affect supply chains across entire industries.