Compact Disk Read Only Memory ( CD-ROM ) which has two types of CDs that the computer uses, CD-R, ( Recordable ) and CD-RW, ( Rewritable ). This type uses a laser-based optical form of storage. Data in CD-R disk cannot be changed afterwards, but in CD-RW users can rewrite or remove data. Also these types have a limit of storage size up to 800 MB or less, they are vary in their capacity. Digital Versatile Disk ( DVD ) it has the same way to read data, but DVDs have more than one layer of data because a signal data layer can have up to 4.2 GB at the highest quality for instance if data is audio or video.
Flash memory is the third type and it is an electronic form of memory which can be used erased and reused. A flash memory card is a small storage device used to store data such as audio, text or pictures. It is the same meaning about USB, but in reality and in computer science USB means Universal Serial Bus which is the port that the flash memory uses to enter in. A USB flash memory sometimes called "Memory stick" and it comes in different types in these days.
A zip driver or disk is a high capacity form of magnetic storage which is portable as the same with other storage devices with various types of capacity.
2 comments:
As a person who works for Dell I think your article on Types of magnetic and optical storage devices is quite impressive .I think a storage device is a hardware device capable of storing information. There are two storage devices used in computers; a primary storage device such as computer RAM and a secondary storage device such as a computer hard disk drive.
Yes dear, they are in general devices capable of storing information. I was talking about optical and magnetic devices not secondary and primary storage my friend in this article . In the case of primary and secondary storage devices, you can consider also secondary storage devices that we cannot change or add to it information or data in some cases such as ROM ( Read Only Memory ) and it has instructions from manufacture company, and hard disk too is secondary storage, actually without secondary storage devices the computer would be as the same with RAM, all instructions and data would be lost if you switched the computer off.
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