What is the approximate storage capacity of cdrom?

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CD-ROM The storage capacity of the slice is approximately 650MB. CD-ROM is a read-only optical storage medium that comes in two specifications.

1. The CD-ROM disc usually refers to a disc with a diameter of 120mm and a thickness of 1.2mm. The nominal capacity is 700MB. It can actually store about 650MB of data information on the computer.

2. Another small optical disc with a diameter of 80mm and a thickness of 1.2mm has a nominal capacity of 210MB. It can actually store about 200MB of data information on a computer. It is more commonly used as a computer peripheral. driver CD.

Extended information:

CD-ROM operating principle.

The disc is made of carbonate with a 15mm diameter hole in the center. A spiral physical track is cast on the disc base, spiraling from the inside of the disc to the outermost ring. The inside of the track is lined with etched "pits". These "pits" and "flats" constitute the storage space. Data information.

Since the laser that reads the optical disc will pass through the plastic layer, it needs to be covered with a metal reflective layer (usually aluminum alloy) to make it reflect light, and then covered with a layer of aluminum alloy layer. Protective layer of acrylic.

It should be noted that when the surface of a CD-ROM becomes dirty or scratched, its readability will be reduced. Although the disc is read from below, try to avoid using hard pens such as ballpoint pens to write on the front of the disc, which can easily scratch the data layer under the protective layer.

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