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 is enctype, ENCTYPE="application/x-www-form-urlencoded" and in its pl...

ENCTYPE="application/x-www-form-urlencoded" and in its place use ENCTYPE="text/plain". The subsequent illustration displays a general form which includes some of the commo

Explain the mechanisms of propagation of radio communication, Explain the m...

Explain the mechanisms of propagation of radio communication. Radio communication deals along with electronic radiation of electromagnetic energy from one point to other by the

How can we read .doc document in asp.net, How can I read .doc document in A...

How can I read .doc document in ASP.Net? You can read from a text file like this.   Private void Button12_Click(object sender, System.EventArgs e) { string path="C:

Work in standard view, Layout view is helpful for laying out Web pages. How...

Layout view is helpful for laying out Web pages. However you can adjust most of your design elements in Layout view, certain changes should be completed in Standard view. When you

Explain approaches to reuse free memory area in a heap, Discuss two main ap...

Discuss two main approaches to reuse free memory area in a heap. Two major approaches to reuse free memory area in a heap are: First-fit: Allocate the first hole which i

Hypertext markup language, Web pages or materials which are in the form of ...

Web pages or materials which are in the form of hypermedia documents accessed through Internet can be located anywhere in world. No matter from where they originated, most Web d

First-order models, First-Order Models: Here if we proposed first-orde...

First-Order Models: Here if we proposed first-order logic as a good knowledge representation language than propositional logic is just because there is more expressive than we

Difference between reply-to and return-path , What is the difference betwee...

What is the difference between Reply-to and Return-path in the headers of a mail function? Ans) Reply-to: Reply-to is where to deliver the respond of the mail. Return-pat

Using the memory map design an absolute decoding circuit, Using the memory ...

Using the memory map below; design an absolute decoding circuit.   The technique is to spot the differences between the start and stop of each device. The Ram chip has the follow

Drawing sequential circuit on paper, design a sequential circuit that conti...

design a sequential circuit that continuously computes the function 2X + 3 or 3X + 1 where the variable X is a three-bit unsigned integer available on a serial interface. A special

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