Which of the following hardware uses flash memory technology?

A.
PCMCIA card

B.
Smart card reader

C.
Secure digital card

D.
DDR2 SDRAM

Explanation:

Secure Digital (SD) card is a non-volatile memory card format used in portable devices such as
mobile phones, digital cameras, and handheld computers. SD cards are based on the older
MultiMediaCard (MMC) format, but they are a little thicker than MMC cards. Generally an SD card
offers a write-protect switch on its side. SD cards generally measure 32 mm x 24 mm x 2.1 mm, but
they can be as thin as 1.4 mm. The devices that have SD card slots can use the thinner MMC cards,
but the standard SD cards will not fit into the thinner MMC slots. Some SD cards are also available
with a USB connector. SD card readers allow SD cards to be accessed via many connectivity ports
such as USB, FireWire, and the common parallel port. It uses flash memory technology.
Answer option A is incorrect. Personal Computer Memory Card International Association (PCMCIA)
card is also known as PC card. The PC card uses a small expansion slot and is primarily used in
laptops. However, PC cards are also available in some of the desktop computers. It does not use
flash memory technology.
Answer option D is incorrect. DDR2 SDRAM is a type of memory module. DDR2 SDRAM is an
enhanced version of DDR SDRAM. It uses a 240-pin memory module and runs at the speed of 400
MHz or higher. It uses an operating voltage of 1.8 volts, instead of 2.5 volts used in DDR SDRAM. This
results in less power consumption. DDR2 SDRAM transfers 64 bits of data twice every clock cycle.
DDR2 SDRAM memory is not compatible with DDR SDRAM memory slots.
Answer option B is incorrect. A smart card reader is an interface device, which is used to read
information from or write information to a smart card. It does not use flash memory technology.