Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Q. Components of magnetic disk?
Disk itself is mounted in a disk drive that comprises arm which is a shaft that rotates disk and the electronics required for input and output binary data. A non-removable disk is permanently mounted in disk drive. Hard disk in a personal computer is a non-removable disk. A removable disk can be replaced or removed with any other disk. Benefit of latter type is that unlimited amounts of data are available with a limited number of disk systems. In addition ZIP cartridge disks are illustrations of removable disks. Figure below illustrates other components of disks.
Figure: The Disk Components
Head mechanism provides a classification of disks in three types. Usually read-write head has been positioned at a fixed distance above platter allowing an air gap. At the other extreme is one head mechanism which in fact comes in physical contact with medium at the time of a read or write operation. This mechanism is used with floppy disk that is a small, flexible platter and the least costly type of disk.
To understand third type of disk we have to comment on relationship between distance of head from surface and data density. Head generates or senses an electromagnetic field of sufficient magnitude to read and write correctly. The narrower head is the closer it should be to platter surface to function. A narrower head signifies narrower tracks and so greater data density that is desirable. But closer the head is to disk, greater are the risks of errors from imperfections or impurities.
To push technology advance Winchester disk was developed. Winchester heads are employed in sealed drive assemblies which are nearly free of contaminants. They are designed to operate closer to disk's surface than conventional rigid disk heads so allowing greater data density. Head is in fact an aerodynamic foil which rest slightly on platter's surface when disk is motionless. Air pressure produced by a spinning disk is sufficient to make foil rise above surface. Resulting non-contact system can be engineered to use narrower heads which operate closer to platter's surface than conventional rigid disk heads.
Explain the term - Instruction execution We know that the fundamental function performed by a computer is the execution of program. The program that is to be exec
A ppropriate Problems for Decision Tree Learning - Artificial intelligence It is a expert job in AI to select accurately the right learning representation for a particular lea
Explain Bottom up parsing. Bottom up parsing: This parse attempts to increase syntax tree for an input string by a sequence of reduction. If the input string can be decreas
Explain difference between Scanning and parsing. Scanning and parsing: Scanning process is the process of recognizing the lexical components in a source string whereas parsin
Example of Pruning: As an example, we are assume that the four choices for player one, there we are looking only two moves ahead 1 for player one and 1 for player two such as
What types of data entry services do you perform? Our business is to understand what data you require entered and in what particular format. After an initial analysis is perfor
Define the terms : spatial locality and temporal locality. Spatial Locality: The spatial aspect means that instructions in close proximity to a recently implemented instruct
Q. Explain Logical shifts with example? Logical shifts LOGICAL SHIFT LEFT and LOGICAL SHIFT RIGHT insert zeros to end bit position and other bits of a word are shifted left or
The free subroutine frees a block of memory lastly allocated by the malloc subroutine. Undefined results happen if the Pointer parameter is not a valid pointer. If the Pointer para
Pass I of the assembler must also generate the intermediate code for the processed statements. Justify your answer. Criteria for selection of a suitable intermediate code form
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd