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


Total Marks: 20


Due Date: 10/Feb/2014

Graded Assignment


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.




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     


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

AbdulRauf plz ap mery msg ka reply krdain ya yahi pr bta dain k main kya krun

FAT16 is the original file system used in DOS and Windows 3.x, and was originally only designed for use on relatively small partitions. It’s been revised so that it’s possible to make a FAT16 partition up to 4GB in size, but no more than that. FAT32 is a revised version of FAT16 that can be used to create much larger partitions and has native support for long filenames, and was introduced with Win98. Both FAT16 and FAT32 are also backwards- and cross-compatible with older versions of Windows and other OSes. However, both FAT16 and FAT32 suffer from many drawbacks: they have weak error recovery and no built-in file security, just to name two. NTFS, which was introduced with Windows NT, is much more secure and robust than FAT16 or FAT32, and offers better recovery from errors. NTFS is now offered on Windows 2000, Windows XP and Windows 2003 Server, although all of the above OS’s can also use FAT16 or FAT32. It’s generally recommended that NTFS be used except when backwards compatibility is urgently needed.

dear Sonia Naz, dont past again and again same things. just comments regarding your problems

AbdulRauf you first..!!

hmmmmmm, g Sonia Naz

These are separate partitions, then why not install Operating system again? , it won't effect data on other partition.

But our user has only DOS bootable drive. 

Scenario 1 : If user can manage a bootable device and install an Operating system his data will be not be effected on other 120 drive.

Scenario 2 : User will boot from DOS bootable drive and attach another usb hard drive to recover data , put some commands and backup data . (we assume our usb hard drive has NTFS so it won't matter how bigger file you copy).

Scenario 3 : User don't have usb drive for backup , and he still can back up some files to (not larger ,due to FAT16 limitations)

Think for more scenarios and share with us ,Talking to you , you reader :p

usb hard drive not work in dos.even ntfs partition.

Dear Adbdu Rauf Agr ap mere q and n say tang ha to sorry for that but i need to clear my assignment concepts.

yar aik bat ka jwb do pir ma yaha nahi ao ga ap logo ko tang kerne

" Agr windows he currpt hone the to instructor system ka mention he na kerta k wo 64bit hai. ku k us ko bi pata hai k system structure same hota hai NTFS ka partiition level per and both formatted in NTFS or FAT32 "

agr hum ne kerna he access data bos base level hai chahe wo dos commmand ho ya bios level to us ko 64bit mention kerne ki zarurt he kiya .

64 bit OS got nothing to do with our assignment , its only to confuse us . 

Farooq Yousaf first of all Ahwas is not genius or that desperate moron to code himself a utility.

Ahwas should use some third party utility like Ubuntu. Ubuntu require FAT16/32 structure of USB drive for installation. It's the perfect choice.


64bit operating system is because the processor's register size is 64bit. So don't worry it's totally downward compatible.

and sorry for coming late to discussion.....!

Scenario is not changeable By Instructor. So we are not installing live OS for this but we use dos base software.

for 4 day we are working only on dos / partition fat16 / data backup / data size problem / access data from disk  but any one know that Dos Run on 64x Architect System ? 


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