distinguis betveen seqencal access a direct access and a random access storage device. write an example of each
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Sequential access:
1. Memory is organized into units of data, called records. Access must be made in a specific linear sequence.
2. In sequential access data is stored at random locations.
3. In sequential access addition of data is fast but retrieval of data is slow.
Ex: Magnetic tape has only sequential access.
1. Memory is organized into units of data, called records. Access must be made in a specific linear sequence.
2. In sequential access data is stored at random locations.
3. In sequential access addition of data is fast but retrieval of data is slow.
Ex: Magnetic tape has only sequential access.
Direct Access:
1. Individual blocks or records have a unique address based on physical location. Access is accomplished by direct access to reach a general vicinity plus sequential searching, counting, or waiting to reach the final location.
2. Indirect access data is stored at sequential locations.
3. Indirect access addition of data is slow but data retrieval is fast.
Ex: CDs had direct access.
Random Access:
1. Each addressable location in memory has a unique, physically wired-in addressing mechanism. The time to access a given location is independent of the sequence of prior accesses and is constant.
Ex: This method is used in airline reservation system or the computerized telephone information service.
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