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Assignment No. 04
Semester: Fall 2013
System Programming-CS609

 

Total Marks: 20

 

Due Date: 10/Feb/2014

Graded Assignment

Instructions:                           

Please read the following instructions carefully before submitting assignment:

 

  • You will submit your assignment before or on due date on VU-LMS.
  • Assignment should be completed by your own efforts it should not be copied from internet, handouts or books.
  • You should submit your .doc File via assignment interface at VU-LMS.
  • Assignment sent via Email will not be replied and accepted in any case.
  • If the submitted assignment does not open or file is corrupt, it will not be marked.
  • You will submit solution only in document (.doc or .docx) File.

 

Objectives:

 

To understand the Disk File Structures and real problems.

 

 

For any query about the assignment, contact at cs609@vu.edu.pk

Assignment Questions

A request before solving it:

Dear Student,

This is very easy assignment which requires only the implementation of a given scenario. This implementation will build your understanding of real mode and protected mode limitations more clearly. So, do not paste your solution from any kind of source. Just do and describe the solution in steps if possible. Otherwise describes the reasons of No answer shortly.

 

Question:                                                                                                                               Marks 20     

Question:

Ahwas installed 64 bit operating system on his PC. Unfortunately, his system crashed and could not boot even in the safe mode. He has two equal partitions of his 120 GB hard drive. He has an important data on his secondary partition. He has a DOS bootable USB drive with FAT16 structure. Is it possible for Ahwas to access his important DATA from hard drive and copy to USB drive through available DOS bootable drive? Give logical reason for your answer.

 

Note: Google the different possibilities for the given scenario assuming that it happen with you. Implement all founded possibilities on your system then suggest a feasible solution for Ahwas within steps. You also can use any other utility within the scenario limitations.

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Replies to This Discussion

i have 1 GB USb it possible  to format it ???

tell me zahoor bhai

yes!

hahh u r lucky have one GB USB.

yes property say try kro is main options a rhy hon gay 

ok formate kro our confirm kro k ap apny system ke D drive say data copy kr skty ho . if yes then there is a solution.

how to copy the data of D drive plz tell 

option available in less then 2GB or use Linux base formatting tools for format simple fat or use windows 95 start up disk.

FAT:

 

FAT is abbreviation of File Allocation Table. Just as its name implies, it is a table marking the position of files. It is very important for the use of the hard disk. If FAT is lost, the data on the hard disk cannot be used because it is unable to be located.
File system of different operating systems are different. In the operating system of personal computer, FAT16 is used in MS-DOS and low-level version. MS-DOS 7.10 and ROM-DOS 7.10 both provide FAT16 and FAT32 for users. The most file system we contact is FAT16 and FAT32.

 

 

FAT16 File System:

The development of hard disk promoted the development of FAT file system. Fat16 after Dos4.0 could manage disk of 128MB. Then the number becomes bigger and bigger, until 2GB. In the decade, the disk management capability of 2GB is beyond actual need.

FAT16 has serious defect: low efficiency usage of large disk. In series of DOS and windows of Microsoft, disk file is in denomination of cluster, and a cluster is only allocated to one file, no matter the file takes up how much space of the cluster. Therefore, even a very small file also has to take up a cluster, and the left space of this cluster is unused, which make the waste of disk space.

MS-DOS 4.0 and the new edition allow FDISK to divide hard disk into 4GB partitions at most. However, MS-DOS FAT file system is only in support of partitions of 2GB. According to this fact, the capacity of hard disk between 2to 4 GB must be divided into multiple partitions, and capacity of each partition should be less than 2GB. The maximum number and size of cluster supported by FAT file system decide the limitation of 2GB.

.

 

 

 

So according to the above info I learnt that, if ahwas has a 16 file allocation table then he cann’t access his data. Because FAT 16 has some serious defect which are as under

FAT16 cannot copy data more than 2 GB.  MS-DOS FAT file system is only in support of partitions of 2GB. The capacity of hard disk between 2to 120 GB must be divided into multiple partitions, and capacity of each partition should be less than 2GB. FAT system is not always the best way to manage hard disk

The maximum number and size of cluster supported by FAT file system decide the limitation of 2GB.

MS-DOS or Windows is not in support of FAT driver from 2GB to 120GB.

So he cannot partition of 120 GB hard drive to 2 GB, because his system crashed and that’s why he cannot copy his data from hard drive to USB drive

wot u thnk about it please tell me

dear sir it is also mention in the assignment he has dos driver with fat 16.so fat 16 can not copy data more then 2 GB.then how can ahwaas copy data of 120 GB???????? THES IS MAIN ISSUE  please clear it

bht confusing hy assignment.

yes.1 day left and still confusion here

there is a note in assignment read and remove ur confusion

sir ne kaha hy k ager answer yes mein ho to steps likhny hein or ager no men ho to logic likhni hy to jb fat 16 120 gb ko sport ni krta to answer no hi hoga or hmein yehi logic deni hogi.

am I right?

ans is no and logic is that

if ahwas has a 16 file allocation table then he cann’t access his data. Because FAT 16 has some serious defect which are as under

FAT16 cannot copy data more than 2 GB.  MS-DOS FAT file system is only in support of partitions of 2GB. The capacity of hard disk between 2to 120 GB must be divided into multiple partitions, and capacity of each partition should be less than 2GB. FAT system is not always the best way to manage hard disk

The maximum number and size of cluster supported by FAT file system decide the limitation of 2GB.

MS-DOS or Windows is not in support of FAT driver from 2GB to 120GB.

So he cannot partition of 120 GB hard drive to 2 GB, because his system crashed and that’s why he cannot copy his data from hard drive to USB drive.

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