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1.12. Read and translate the text flash memory device

A memory card, also known as a smart card or multimedia card, is one f the external storage media of a personal computer and multifunction rminal electronic equipment. A semiconductor memory card has an internalized non-volatile memory, which is accessed by a connected device enabling the semiconductor memory card to be used as a recording medium. The most widely used solid-state memory devices include flash-memory chips configured on a small removable memory card, and are commonly referred to as flash memory cards. A flash memory is a type of EEPROM that can be erased and reprogrammed in blocks instead of one byte at a time.

Compared with other memory devices, flash memory devices have many advantages, which include their non-volatility, speed, ease of erasure and reprogramming, small physical size and related factors. A flash memory is a semiconductor memory showing low power consumption and maintaining stored information even when power is off. Flash memory devices typically use a one-transistor memory cell that allows for high memory densities, high reliability, and low power consumption. Flash memories can program, read and erase data for multiple times, and data stored therein can be maintained even if the power applied thereto is off. Flash memory devices do not require refreshing and can store data indefinitely after the power is removed. Flash memory devices are applicable for multiple operations of data writing, reading and erasing. Flash memory devices have achieved a commercial success in an electronic industry because they are able to store data for a relatively long time even without a power supply. Flash memory has been widely used for high volume data storage in devices such as personal computers, personal digital assistants (PDAs), cellular phones, digital TV, digital camcorder, digital camera, and MP3 players.

Flash memory brings convenience to information industries for storage of data. The multimedia network technology has developed to the extent that digital contents such as video information are distributed via a communication network such as the Internet. For example, traditional film cameras have been widely replaced by digital cameras capable of recording images that may be directly downloaded to and stored on personal computers. The pictures recorded by digital cameras can easily be converted to common graphics file formats such as joint photographic experts group (JPEG), graphic interchange format (GIF) or bitmap (BMP), and sent as e-mail attachments or posted on web pages and online photo albums. Many digital cameras are also capable of capturing short videoclips in standard digital video formats, for example, moving picture experts group (MPEG), which may also be directly downloaded and stored on personal computers or notebook computers. Small flash-memory cards have been designed that have a connector that can plug into a specialized reader, such as for compact-flash, secure-digital, memory stick, or other standardized formats.

Flash memory cards are formed in card shapes in which memory chips are sealed in card type outer shells. Flash memory cards are designed in many standards such as an SD (Secure-Digital) card, a multimedia card, a Smartmedia, a compact flash (CF) card, and a memory stick. SD card is an extension of the earlier MultiMediaCard (MMC) format. SD cards are hot-swappable, allowing the user to easily insert and remove SD cards without rebooting or cycling power. Information equipment such as personal computers, PDAs, digital cameras, and cellular phones are generally provided with a card slot for mounting a flash memory card.

More recently, flash memory cards are being designed that contain a USB connector which is constructed that the flash memory card is insertable and extractable in a direction parallel to a mounting wiring board through the slot port. USB flash-memory drives and devices have been developed to transport data from one host to another, replacing floppy disks. A USB-flash card can have a capacity of more than ten floppy disks in an area not much larger than a large postage stamp.

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