Digital Versatile Disc Read Only Memory, or DVD-ROM is a media storage disk that closely resembles a CD or compact disk. The major difference is that the DVD - ROM is formatted to hold far more data. A CD commonly has a capacity of 650 megabytes, while the smallest capacity DVD can store about seven times more data, or 4.38 gigabytes. There are various kinds of DVDs, but the DVD ROM refers to a read-only disc, or a disc that cannot be written over. Blank DVDs with designations like DVD-R and DVD +R are formatted, recordable DVDs. The R and +R refer to competing format standards, but both will record movies, audio or other data. A DVD ROM encodes data in the form of a spiraling trail of pits and lands separated by mere nanometers. The trail starts at the center of the DVD-ROM and winds around countless times until it reaches the outer edge. In the case of a double layer disk, the trail continues on a second layer of material. If the disc is also double-sided, the trail of pits and lands extends to side two.
A laser beam in the DVD player tracks the beam as the disc spins, while a special device reads the intensity of the reflection as it bounces off the pits and lands. The reflective variance gets translated to bits of data which form bytes.
DVD ROM Capacities
Single-sided single-layer disc 4.38 GB
Single-sided double-layer disc 7.95 GB
Double-sided single-layer disc 8.75 GB
Double-sided double-layer disc 15.9 GB
Flash memory is a non-volatile computer storage chip that can be electrically erased and reprogrammed. It was developed from EEPROM -electrically erasable programmable read-only memory and must be erased in fairly large blocks before these can be rewritten with new data. The high density NAND type must also be programmed and read in smaller blocks, or pages, while the NOR type allows a single machine word (byte) to be written or read independently.
Example applications of both types of flash memory include personal computers, PDAs, digital audio players, digital cameras, mobile phones, synthesizers, video games, scientific instrumentation, industrial robotics, medical electronics.
A USB flash drive is a data storage device that includes flash memory with an integrated Universal Serial Bus interface. USB flash drives are typically removable and rewritable, and physically much smaller than a floppy disk. Flash drives of 256 gigabytes are available, Storage capacities as large as 2 terabytes are planned, with steady improvements in size and price per capacity expected.
As seen between the two storage media viz DVD ROM - Laser technology and Flash Memory - Electronics components viz chips etc, since the Flash memory technology can store more capacity, will the following implementation can increase the storage capacity on a DVD ROM ?
1. A Double-sided double-layer DVD disc can store max 15.9 GB. As we see the circular shape of the DVD ROM (Circle - center, common radius), if we increase the radius of the circular DVD ROM, will it allow us to increase the capacity as area increases of the circle resulting in more pits and lands ?
This solution results in also creating DVD ROM Drives either internal or external drives of the similar circle where this New DVD Rom to be placed.
2. As mentioned, A DVD ROM encodes data in the form of a spiraling trail of pits and lands separated by mere nanometers. The trail starts at the center of the DVD-ROM and winds around countless times until it reaches the outer edge. In the case of a double layer disk, the trail continues on a second layer of material. If the disc is also double-sided, the trail of pits and lands extends to side two.
Using the same circular area of the current DVD ROM Available, using Advanced Laser Techniques i.e. A High Powered Laser beam i.e. more than 650nm-wavelength red laser technology,
will this help in increasing the storage capacity of the DVD ROM ?
Will both the methods work for increasing DVD ROM Storage ?
Thanks & Regards,
Prashant S Akerkar