CD (compact disk) drives are used to read data recorded on a CD-ROM (compact disk read-only memory) disks. Data is recorded on CDs in the form of microscopic pits. The presence or absence of the pits, which is read by a red laser beam inside the drive, is used to represent digital data - the 1s and 0s. Factory-made CDs, such as audio CDs and video CDs, are made by pressing moulds, which create the pits on the disks.
On a CD-RW drive (CD writer), the pits are burnt on to a CD-R (CD writable) or a CD-RW (CD rewritable) disk using a more powerful laser. With a CD-R disk, data once written cannot be erased. On a CD-RW (CD rewritable), data can be written and erased countless times. A CD drive cannot read a DVD (Digital Versatile Disc) because the pits on a DVD are much more densely packed. To read a DVD, you need a DVD drive. DVD drives can also read CD disks. CD-RW combo drives have the ability to read DVD disks. To create or "burn" DVDs however, you need DVD-RW (DVD writers) drives. Liteon and Plextor make good CD and DVD writers. A CD writer or a DVD writer will not function as a writer until a CD/DVD burning application such as Nero Burning ROM is installed. Liteon ships a limited functionality Nero Express with its drives while some others provide the full version. CD-R and CD-RW disks come in capacities of 650 and 700 MB. Mini CDs, which are smaller in size and can be easily carried in a shirt pocket, hold 170 MB. Some CDs are available in the shape of a visiting card and are typically used to provide a multimedia version of a company or a business. DVD-R can store 4.7 GB of data. Dual layer DVD-Rs disk store data on two diferent lawyers and have a capacity of 8.4 GB. Double-sided DVD-R/DVD-RW disks store data on both sides of the disk and can store 17 GB of data.
Factory-made CDs have labels painted on them. However, with burnt CD consumables such as CD-Rs, CD-RWs, DVD-Rs DVD-RWs having neat labels is an issue. Some CD consumables come with no paint work and allow a sticky paper label. However, in high-speed drives, these labels might come unstuck and destroy the disk and the drive. Many people prefer using CD labeling pens. These pens have very soft tips and make permanent labels. (Using hard tipped pens scratches the disk.) Verbatim has introduced a new CD writer and disk technology called LightScribe. After writing the data, you flip the CD to burn the label using the writer. Both Lightscribe drives and Lightscribe disks can be expensive. Printers from Canon and Epson allow you to print on special printable CDs. If you need to print labels on plain-vannilla CD/DVD disks, get a CD printer from Techcom costing Rs. 4000.
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