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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

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.

ð     Contact through Skype or email for any other query.



Views: 9699


Replies to This Discussion

     Abdul Rafay bahiya ap kidr hai plz reply to kr dain 

DEAR SIR FAROOQ yausaf  usb fat 16is  must we cannot change it according to assinment and else that we can use any other utilty butcan't change fat 16 with any other some thing

fat16 best for dos command

we use 13h ext (BIOS Function) command for access hard disk without any device drivers in dos.

koi tou exact solution post kr dye

handout page no. 310

The following slides explain how the NTFS volume can be accessed in DOS. Normally it
can not be accessed if the system has booted in DOS as the DOS device drivers do not
understand NTFS

Accessing NTFS volume in DOS
• NTFS volume can not be accessed in DOS
using DOS based function like absread( )
• DOS device drivers does not understand
the NTFS data structures like MFT etc.
• If NTFS volume is accessed in DOS, it will
fire the error of Invalid Media.

How to Access NTFS volume using
BIOS Functions
• If the system has booted in DOS then a
NTFS volume can be accessed by an Indirec
Method, using BIOS functions..
• This technique makes use of physical
• Sector can be accessed by converting their
LSN into LBA address and then using the
LBA address in extended BIOS functions to
access the disk sectors.

ic ko zra ghoor sy parhien...plz reply k Ahwas k pass jo hard drive ha wo NTFS file system e ha. becuse its more than 2 GB kesy access ho skti ha hard disk? by using bootabl DOS USB with FAT16

plz reply soooon

any one please upload the right  solution 

dear friends i read all your comments that posted in previous pages,
i advise all of you, just listen lecture no 40 at least one time, then you will be able to easily conclude about this assignment,
for the sake of simplicity i want to tell all of you that, " it is possible to access NTFS file structure in dos with the help of BIOS functions, we can access data indirectly with converting LSN(logical sector number) into LBA, because FAT16 is using LBA. one more thing to remember that we can access NTFS data with using the physical address. to achieve physical address we have to convert LNS into LBA.
now plz dont discus further about 64bit or 32 bit, you just focus on data accessing with only FAT16 usb drive.
there is no need to show any data copying, you just tell in assingment with logics its possible to access.

yar problem ye nahi k fat16, 2gb, dos.

sirf ye k 64bit system ma dos ki value kiya hoti hai.

wo to sub ko pata hai k 13h ki extn use ker k hum data access ker skte hai lekin.

dear, Farooq Yousaf, ap k sawal he ajeb hote hen.

sirf ye k 64bit system ma dos ki value kiya hoti hai.

kia maltab ha is swal ka?

Kisi ni 64bit System Use kiye ?

we know that dos run on CHS partition in CHS just 24bit width size that support maximum

8GB if we convert this CHS to LBA 32bit Size we access more then 127gb and with LBA 64bit thats support 8 zetabyte,

yar , here we just need to copy one simple text file for the sake to simplicity, its enough to clear the assignment task that given by instructor, it is not compulsory to copy more data.


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