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

Fifo discipline, You have been retained to examine how many check-in agents...

You have been retained to examine how many check-in agents should be used at a check-in counter for a big hotel. During normal business hours, customers arrive at a rate of about 2

Anti reflection coating, expression for thickness and refractive index of c...

expression for thickness and refractive index of coating material to act as anti reflection coating

Explain error-detection code, Q. (192.8)10 - (AE.E)16 = (X)8, Find value of...

Q. (192.8)10 - (AE.E)16 = (X)8, Find value of x. Use 8's complement method. Q. Write first 10 numbers in the base 4. Q. Explain Error-Detection code & Error-correction code w

Explain the relationship b/w translated & load time address, Explain the re...

Explain the relationship amongst Translated address and Load time address. Translated address: Address assigned through the translator Load time address: Address ass

Instruction pipeline-level of processing, Classification according to level...

Classification according to level of processing According to this classification, computer operations are classified as arithmetic operations and instruction implementation. Ne

Which function type is used for using "at exit-command", Which Function typ...

Which Function type has to be used for using "at exit-command" ? To Use AT EXIT - COMMAND, We must assign a function Type "E" to the relevant function in the MENU Painter OR S

Design-centered virtual manufacturing, Design-Centered Virtual Manufacturin...

Design-Centered Virtual Manufacturing This gives manufacturing information to the designer throughout the design phase. In this observing the short term and long time definitio

Creation deductive inferences, Creation Deductive Inferences : Here we...

Creation Deductive Inferences : Here we have shown how knowledge can be represented in first-order logic or how rule-based expert systems expressed in logic can be constructed

Analysis of amdahls law, The outcomes of analysis of Amdahl's law are: 1...

The outcomes of analysis of Amdahl's law are: 1) To optimize the performance of parallel computers, modified compilers need to be developed which should aim to decrease the numb

Define throughput, Define throughput?  Throughput in CPU scheduling is ...

Define throughput?  Throughput in CPU scheduling is the number of processes that are completed per unit time. For long processes, this rate might be one process per hour; for s

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