Amit has decided to use either a DVD-RW or DVD-R. Select statements that are TRUE for these storage devices.
P : Both DVD-R and DVD-RW are read only.
Q : DVD-R can be written to only once.
R : DVD-RW can be written to many times.
S : Both DVD-R and DVD-RW can be written to only once.
- ((a))
P only
- ((b))
S only
- ((c))
P and R only
- ((d))
Q and R only
Show Answer
Q and R only
DVD stands for Digital Video Disks or Digital Versatile Disks.
- A DVD stores much more data than a CD-ROM. Its capacities are 4.7GB, 8.5GB, and 20GB, etc.
- The capacity depends on whether it is a single layer, double layer; single-sided or double-sided disk.
- DVD uses a laser beam of shorter wavelength than CD-ROM uses and therefore more tracks are available. Working principles of DVD disks are the same as those of a CD-ROM, CD-R, or CD-RW.
- The Speed of DVD, X=1.38 MB/s.
DVD-R: It is a recordable DVD, the same as a CD-R disk. The user can write data once on a DVD-R, then read the data as many times as required.
DVD-RAM: It is a rewritable DVD, the same as a CD-RW disk. DVD-RAM uses a phase change technology to write, read, and erase data.
| Medium | DVDROM DVD±R DVD±R W |
|---|---|
| Capacity | - 4.7GB to 8.5GB |
| Advantages | - Large storage capacity - Some types (DVD±RW) can be reused or rewritable. - Can be used in certain models of DVD players. |
| Disadvantages | - Not all computers can read DVD±R or DVD±RW disks. - DVD±R discs are „write once‟, which means once data is copied to it, new or additional data cannot be added |
| Primary Uses | - Same as CD-ROM/ CD-R/CD-RW |
| Storage mechanism | - Optical |











