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

What are the methods for handling deadlocks, What are the methods for handl...

What are the methods for handling deadlocks?  The deadlock problem can be dealt with in one of the three ways:  a. Use a protocol to prevent or avoid deadlocks, make sure th

Analysis of algorithms, Analysis of Algorithms For this task, each stu...

Analysis of Algorithms For this task, each student should do two things: An empirical analysis of the runtime and comparisons made for all algorithms as a function of input si

Explain the hamiltonian path, What is Hamiltonian path?  A Hamiltonian ...

What is Hamiltonian path?  A Hamiltonian path in a directed graph G is a directed path that goes by each node exactly once. We consider a special case of this difficulty where

Floating point format, consider the 8 bit floating point format including s...

consider the 8 bit floating point format including support for normalised nimbers and nonnumeric values.it included 3 bits for mantissa and 4 bitys for excess 7 exponent

Function of in network access layer in tcp/ip protocol stack, What is the f...

What is the function of in network access layer in TCP/IP protocol stack? Function of Network Access Layer: The network access layer is the lowest layer within Internet

Subtract the numbers using 2's complements, Subtract -27 from 68 using 2's ...

Subtract -27 from 68 using 2's complements. Ans. By using 2's complement 68-(-27)= 68-(-27) 2's complement representation of 68 = 01000100(64+4) 2's complement representatio

Canonical genetic algorithm - artificial intelligence, Canonical Genetic Al...

Canonical Genetic Algorithm: In such a scenario with all search techniques there one of the first questions to ask along with GAs is how to define a search space that is actua

Data rate limitations in PSTN's by using nyquist theorem, Explain with the ...

Explain with the help of Nyquist theorem, the data rate limitations in PSTN's. Data rates in PSTNs : A voice channel in a public switched telephone network is band restricted

Define the system analysis of object oriented modelling, Define the System ...

Define the System Analysis of Object oriented modelling System Analysis: In this stage a statement of the queries is formulated and a model is designed by the analyst in enc

State about the internet services, State about the Internet services I...

State about the Internet services Internet services are provided automatically, in many other implementations the certificate is stored on a separate database or token such as

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