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.
Convert the decimal number 45678 to its hexadecimal equivalent number. Ans: (45678) 10 =(B26E) 16 (45678) 10 =(B26E) 16
What are the advantages of batch processing This has the advantage which jobs can be processed when computer resources are less busy (for example during the evening or at night
Granularity Granularity refers to the quantity of computation done in parallel relative to the dimension of the entire program. In parallel computing, granularity is a qualitat
Describe the operation of voltage to frequency ADC. Ans: A voltage-to-frequency converter i.e. VFC is an oscillator that frequency is linearly proportional to a control volt
Set Value is ready to ActiveX Object from the form. Let Value is retried to ActiveX Object from the form. Get- Assigns the value of an expression to a variable or property.
how CSMA protocol is improved through persistence methods & collition detection
Explain the uses of Keyboards An alphanumeric keyboard for a graphics system is used primarily as a device for entering text strings. Keyboards can also be provided with featur
Q. Explain about Cathode Ray Tubes? Cathode ray tube is the major technology on that televisions and monitors have been based. CRT is a partially evacuated glass tube which is
What are the Structural Notations These notations comprise static elements of a model. They are considered as nouns of UML model that could be conceptual or physical. Their ele
What do you understand by Electronic Funds Transfer? Electronic Funds Transfer: It's an electronic payment method that transfers the money value from one bank account to
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