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

Visual basic applications in general context, Describe some general uses fo...

Describe some general uses for Visual basic applications in general context? Ans) Visual basic can be used within almost all Microsoft products such as Map point, Visio, Auto ca

What do you mean by consumer behavior, What do you mean by consumer behavio...

What do you mean by consumer behavior? Explain the factors influencing consumer behavior? Factors Influencing Consumer Choice: Consumer choice or decision behaviour refers to t

Subtract, Write the Add/subtract rule for floating point numbers. Ans:...

Write the Add/subtract rule for floating point numbers. Ans: a. Select the number with the smaller exponent and shift its mantissa right a number of steps equal to the differe

Ann representation, ANN Representation: Mostly 'ANNs' are taught on "A...

ANN Representation: Mostly 'ANNs' are taught on "AI" courses since their motivation from brain studies and the fact which they are used in an "AI" task and namely machine lear

What is cache memory, Q. What is Cache Memory? Cache memory is a very f...

Q. What is Cache Memory? Cache memory is a very fast and small memory between CPU and main memory whose access time is closer to processing speed of CPU. It behaves as a high-s

What is the difference between a structure and a table, What is the differe...

What is the difference between a structure and a table? Structures are constructed the almost the similar way as tables, the only dissimilarity using that no database table is

What do you mean by embedded system, It is a mixture of hardware and softwa...

It is a mixture of hardware and software to perform needed task

Programmed input - output technique for computers, Q. Programmed input - ou...

Q. Programmed input - output technique for computers? Programmed input/output is a useful I/O technique for computers where hardware costs need to be minimised. Input or output

Explain about aggregations, OLAP can process difficult queries and give the...

OLAP can process difficult queries and give the output in less than 0.1 seconds, for it to achieve like performance OLAP uses aggregations. Aggregations are built by aggregating an

Final implementation of object oriented modelling, Final Implementation of ...

Final Implementation of Object oriented modelling Final Implementation: At this phase, the final execution of classes and  relationships developed while object design takes

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