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GDB Topic Announced Dated: Aug 12, 15

Dear Students,


Topic of GDB is as under:


FAT32 and NTFS are two files systems supported by Windows Platform. FAT32 does not have security features like owner information and privileges as NTFS file system has.

So, If we require to upgrade our FAT32 to introduce some security levels to some extent, what would be the structure level changes you suggest.

Consider one thing while answer the GDB is that your structure would not be similar to NTFS. But you can get idea of security structure used in NTFS file structure.

Important Notes:

1 - Write the name of header you want to introduce in FAT32 structure then short description of that header.

2 – Only three headers would be written in your answer. Writing more than three would cause in deduction of marks.



- GDB would be available for submission for 2 days that are 17/8/2015 and 18/8/2015 (Monday - Tuesday)

- Write your answer in bullets. Answers provided in paragraphs are marked as satisfactory.

- No GDB is accepted via e-mail.

- Copied comments / answers from any source are awarded as zero which results in deduction of absolute 5 marks from 100.


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Replies to This Discussion

mila kiya kisi ko ?

Access Control Lists in the Security Descriptor

ACE Field


ACL Size

Number of bytes, allocated for the ACL. This includes the ACL header, ACEs, and remaining free space in the buffer. The size of an ACL varies with the number and size of its ACEs. The maximum size of an ACL is 64K, or approximately 1,820 ACEs, depending on the size of the ACEs. However, for performance reasons, the maximum size is not practical.

ACL revision

Revision number for the ACL's data structure. The structure of an ACL is the same for all revisions, but the structure of ACEs in the ACL can vary

ACE count

Number of ACEs in the ACL. A value of zero means the ACL has no ACEs — it is empty; therefore, access-checking can stop. Note that an empty DACL differs from a NULL DACL. An empty DACL gives no access to anyone, but a NULL DACL gives unconditional access to everyone, and should therefore be avoided.


 An ordered list containing zero or more ACEs.During an access check, ACEs are  processed in the order in which they are listed.


An ordered list containing zero or more ACEs.During an access check, ACEs are processed in the order in which they are listed.


Attribute Type



$FILE_NAME $Secure  

Security Descriptor Stream. Named data stream that contains a list of all the Security Descriptors on the volume.

$INDEX_ROOT $SDH Security Descriptor Hash index root

Security ID index root

$INDEX_ALLOCATION $SDH Security Descriptor Hash index storage allocation table

Security ID Index storage allocation table

$BITMAP $SDH Security Descriptor Hash index bitmap

Security ID Index bitmap

This is NTFs security structure can we used it in FAT32 matadata.

maire khial s

System File File Name MFT    Record Purpose of the File

Security file  



    Contains unique security descriptors for all files within a


header k name tak ni mil rahay mujhe

mujy b kuch nhi mil raha GDB ka or time is very short


Security ka header "Secure" use kr sakty hain.


  • ext
  • ext2 
  • ext3 
  • ext4 

these are extensions not headers :( :(

what are the headers????

any one known plezzzzzzzzz share

i really dont know 


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