Recordable Optical Disk
Recordable Optical Disk
In addition to the read only CDs and DVDs, recordable optical disks are also available. Users can record music, video, audio and data on it. The recordable optical disks are—
Compact Disk-Recordable (CD-R)
Compact Disk-Recordable (CD-R) is a Write Once-Read Many (WORM) disk. A CD-R disk allows the user to write data permanently on to the disk. Once the data is written, it cannot be erased. CD-R disk uses a laser that burns pits into the disk surface. It looks like a CD disk externally. To write to a CD-R disk, a device named CD-Writer or CD–burner is required. A CD-R disk can store 700 MB of data that can run for 80 minutes. CD-R is used to create music CDs in home computers, back up data from other storage devices, archives of large data, etc.
Compact Disk-ReWritable (CD-RW)
Compact Disk-ReWritable (CD-RW) allows data to be written, erased and re-written on. The capacity of CD-RW is same as a CD. They generally do not play on all CD-ROM drives.
Digital Video Disk-Recordable (DVD-R)
Digital Video Disk-Recordable (DVD-R) allows recording of data on a DVD. A DVD writer device is required to write the data to DVD. The data once written on a DVD cannot be erased or changed.