What two characteristics give a DVD more storage capacity than a CD?
The DVD uses a red laser with a smaller wavelength, not the long wavelength red laser that is used for CDs. The shorter wavelength allows the beam to be more accurate. This accuracy means that more data can be stored on a DVD than a CD. Data can only be written on one side of a CD, but a DVD can be written on both sides depending on the type of DVD (for example, DVD-5) you have.
For more information see the link below.
Storage capacity refers to how much disk space one or more storage devices provides. It measures how much data a computer system may contain. For an example, a computer with a 500GB hard drive has a storage capacity of 500 gigabytes. A network server with four 1TB drives, has a storage capacity of 4 terabytes. Storage capacity is often used synonymously with "disk space." However, it refers to overall disk space, rather than free disk…
I have a 12 volt gate opener with a solar panel which came with a 7amph battery. Can a 12 volt 8amph be used?
The DVD uses a different laser with a smaller wavelength, not the long wavelength red laser that is used for CD's. I believe the DVD laser is in the ultraviolet spectrum. Anywho, the smaller laser allows the DVD to have smaller "bumps" (which is what the laser reads). Since they are smaller, more can fit onto a disk. Also, DVD's can be 2-layer. Twice the data.
The biggest disadvantage is that it has very little storage capacity. The maximum storage capacity of a (last generation) floppy disk is around 240 megabytes. A USB stick, CD, or DVD-ROM can all hold much more than this. Secondly, fewer and fewer computer termnials are being manufactured with floppy disk drives, since they have been replaced by other storage methods. This means it is hard to get your data off the disk. Thirdly, floppy disks…