Question

Which of the following storage device records data only once?

i) CD-R
ii) CD-RW
iii) Pen drive
iv) Memory card

Answer 1

Write once read many (WORM) describes a data storage device in which information, once written, cannot be modified. This write protection affords the assurance that the data cannot be tampered with once it is written to the device.

Answer 2

Option i) CD-R

CD-R storage device records data only once.

• Compact Disc-Recordable, sometimes known as CD-R, can also be written as CD-WO (write once) or WORM (write once, read many). It is a disc and drive that can be used to write information on the disc only once and read from the disc numerous times.
• refers to a recordable compact disc. Blank CDs called CD-Rs can store data that has been written to them by a CD burner. Since CD-Rs are frequently used to record audio, which can be played back by most CD players, the word "recordable" is employed.
• On the CD, information is kept in a pattern of pits in the aluminium and "land"—unpitted spaces. By flashing a laser onto the disc and measuring how much light is reflected back, the CD-ROM drive reads the data on it. Pitted portions reflect light less strongly than unpitted ones do.
• There is general agreement among the manufacturers who have conducted testing that CD-R, DVD-R, and DVD+R discs should have a life expectancy of 100 to 200 years or more under recommended storage conditions, while CD-RW, DVD-RW, DVD+RW, and DVD-RAM discs should have a life expectancy of 25 years or more.

#SPJ2