Block format and disk layout on cd-rom, Computer Engineering

Assignment Help:

Q. Block Format and Disk Layout on CD-ROM?

A typical block format is displayed in Figure (a). It comprises the subsequent fields:

  • Sync: Sync field identifies beginning of a block. It comprises a byte of all 0s, 10 bytes of all 1s and bytes of all 0s.
  • Header: The header comprises block address and mode byte. Mode 0 specifies a blank data field and mode 1 specifies use of an error-correcting code and 2048 bytes of data as well as mode 2 specifies 2336 bytes of user data with no error correcting code.
  • Data: User data.
  • Auxiliary: Extra user data in mode 2. In mode 1 this is a 288-byte error correcting code.

2220_Block Format and Disk Layout on CD-ROM.png

Figure: Block Format and Disk Layout on CD-ROM

However what is Min (Minute), Sec (Second) and Sector fields in Header field?  The sectors of CD-ROM aren't arranged like sectors in hard disks (Please see Figure (b)). Rather they are all equal length segments. If we rotate CD drive at constant speed the linear velocity of disk surface movement will be higher at the outer side than that of centre portions. To offset this liner speed gap either we store less data on outer sectors or we decrease speed of rotation while reading outer tracks. CD follows later approach which is instead of moving CD drive at constant velocity. It's rotated at variable velocity. Speed or rotation of disk decreases as we move away from centre such that sector's can be read in constant time. This method of reading is known as Constant Liner Velocity (CLV).


Related Discussions:- Block format and disk layout on cd-rom

Children''s game of rock, Design a game application that plays the children...

Design a game application that plays the children's game of rock, paper, scissors. The user enters a letter indicating a choice. The Math.random method is then used to pick a value

Why disable statements are not allowed in functions, Why disable statements...

Why disable statements are not allowed in functions? If  disble  statement  is used  in function,it  invalids  function  and  its  return  value.  So  disable statements aren't

Translate the following sentences into predicate logic, Translate the follo...

Translate the following sentences into predicate logic. Give as much structure as possible. Provide a translation key for each predicate letter and individual constant. In your tra

What is a daemon, What is a Daemon? A daemon is a method that detaches ...

What is a Daemon? A daemon is a method that detaches itself from the terminal and runs, disconnected, in the background, waiting for requests and responding to them. It can als

Association and classes betwnn student and university, Association and clas...

Association and classes betwnn student and university Association and classes are alike in the sense that classes describe objects, and association describe links. Figure shows

What is rolap, Functioning of ROLAP happens concurrently with relational da...

Functioning of ROLAP happens concurrently with relational databases. Data and tables are stored as relational tables. To hold new information or data new tables are formed. Functio

What is parsing, What is parsing? Parsing is the process of analyzing a...

What is parsing? Parsing is the process of analyzing a text, formed of a sequence of tokens, to find out its grammatical structure regarding a specified formal grammar. Parsing

What are the rules of timescale directive, What are the Rules of Timescale ...

What are the Rules of Timescale directive Rules -  'Timescale directive, like all compiler directives, affects all modules compiled after directive,  whether  in  same  fi

Interpreted language and a compiled language, Difference between an interpr...

Difference between an interpreted language and a compiled language? Ans) A compiled language is written and then run by a compiler which checks its syntax and compresses it int

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd