Which of the following uses a shorter wavelength and allows for almost six times more data storage than on a DVD?

Question

Options

• ABlu-ray Disc
• BDigital Linear Tape (DLT)
• CBluetooth
• DBlue Jacking

• A
  81% (34)
• B
  12% (5)
• C
  5% (2)
• D
  2% (1)

Explanation

Blu-ray Disc, also known as Blu-ray or BD, is an optical disc storage medium. It is designed to supersede the standard DVD format for storing high-definition video, PlayStation 3 games, and other data, with up to 25 GB per single layered, and 50 GB per dual layered disc. Blu-ray Disc was developed by the Blu-ray Disc Association, a group representing makers of consumer electronics, computer hardware, and motion pictures. The disc has the same physical dimensions as standard DVDs and CDs. It is called Blu-ray Disc because of the blue-violet laser which is used to read the disc. Blu-ray uses a shorter wavelength, a 405 nm blue-violet laser, and allows for almost six times more data storage than on a DVD. Answer option C is incorrect. Bluetooth is a standard for very low powered and short-range radio connections. It is used to link personal access devices (PDA), mobile phones and laptops, and provides them with Internet access via hot spots. Bluetooth uses the 2.4 Ghz spectrum with a data rate of about 1 Mbps. As a radio technology, Bluetooth does not require line of sight like an infrared connection requires. The maximum transmission range of Bluetooth is around 10 meters. Highpowered Bluetooth would extend the range to 100 meters. Answer option D is incorrect. Blue Jacking is the process of sending unsolicited messages over Bluetooth to Bluetooth-enabled devices such as mobile phones, PDAs or laptop computers, sending a vCard which typically contains a message in the name field to another Bluetooth enabled device via the OBEX protocol. Answer option B is incorrect. Digital Linear Tape (DLT) is a magnetic tape data storage technology developed by Digital Equipment Corporation (DEC). DLT drives support hardware data compression. Media are guaranteed for 30 years of data retention under specified environmental conditions. However, they are easily damaged by mishandling. Current manuurers of cartridges for the DLT market are Fujifilm, Hitachi/Maxell and Imation.

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