DVD-ROM stands for Digital Versatile Disk-Read Only Memory.
A read-only DVD is used to store the files permanently which cannot be changed, write-over, or erased.
We can use DVD-ROM for allotment of large applications which increase the size of a CD-ROM disc. The DVD-ROM was introduced through the group of ten international companies in 1996 and developing DVD and HD-DVD formats for media, software, and hardware.
Through DVD-RAM and DVD-ROM drives, we can read easily in computers, but typically not in DVD drives connect with the TVs and home theater systems.
We can store around 4.38 GB of data in DVD-ROM but CD-ROM only stores 650 MB of data. A typical DVD-ROM can hold up to 17 GB/s of data if both sides of the disc are writable.
Characteristics of DVD-ROM
- The discs which are prerecorded using molding machines that physically stamp data onto the DVD. A such disc is a form of DVD-ROM because data can only in the read form and not written or erased.Some examples of rewritable DVDs are DVD-RW, DVD+RW, and DVD-RAM.
- Capacity: 4.7 GB (single-sided, single-layer – common)
8.5 GB (single-sided, double-layer)
9.4 GB (double-sided, single-layer)
17.08 GB (double-sided, double-layer)
- DVD-ROM basically are of two types: one is blank and other contains data.Each disc is 0.6 mm thick, and are combined together to form a DVD disc. The process of combining the two-disc together must be done carefully to make the disc as flat as possible to avoid ‘disc-tilt’.
- DVD-ROM can be recordable and rewritable both. Recordable DVD discs supporting dual-layer technology are backward-compatible with some hardware developed before the recordable medium.
- If we compare DVD-ROM to CD-ROM, has the same diameter is 5 inch and 1.2 mm thickness.But a DVD-ROM uses a shorter wavelength laser with tighter compacted pits, the disc capacity increased. The minimum size of DVD-ROM stores approximately 7 times more data than CD-ROM.
Advantages of DVD-ROM
- Sharing Data and Files:the one who is not in the local network then we have so many several ways to transfer the files. A DVD-ROM can be used to transfer the files to anyone. Because DVDs give us more space than a CD-ROM disc.
- Restore/Back-up:A DVD provides a large storage where we can back up the important information and applications. Any computer user knows the importance of backup who has suffered. We can save the entire image using the software eg. Norton’s Ghost to back up the whole drive.
- Affordable cost per gigabyte: If we talk about the cost of DVDs per gigabyte then DVDs have an advantage, we can buy the set of blank DVDs from anywhere. These are the most significant savings as compare to flash drives, etc.
Disadvantages of DVD-ROM
- Rewriting:DVD-ROM is a poor choice when you are storing data for an ongoing project that you’ll need to change on a regular basis.DVD is good to use when we don’t need to change the data on a regular basis.
- Compatibility issue: We can face issues with some programs with the drive since DVD-ROM is a relatively new technology.for example, Real Jukebox, some music management software program, may not work with some drives.
- Resistless:DVDs are vulnerable to scratching, breaking, and wrapping when stored improperly. Damage to your DVD can mean partial or even total data loss.
- Expensive: It is more expensive than DVD-RAM and many other DVD and CD disks.
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