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thnx alot wafa

Thanks  wafa gi

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thanxx wafa and fatima 

thxxx

AOA,

My today paper

80% mcqs from moaz file:

Subjective question:

1)Write three Data Structures for Memory DOS use? 
Ans
• MCB ( Memory Control Block )
• EB ( Environment Block )
• PSP ( Program Segment Prefix )

2)Scan Disk Surface Scan for Bad Sectors

• It attempts to write a block.
• After write it reads back the block contents.
• Performs the CRC test on data read back.
• If there is an error then the data on that block is not stable the cluster of that block should be marked bad.
• The cluster is marked bad by placing the appropriate code for bad cluster so that they
may not be allocated to any file.

3) How Accessing NTFS volume in DOS?

• NTFS volume can not be accessed in DOS using DOS based function like absread( ) etc.
• 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.
4) How to recovered a Deleted Files?

• 0xE5 at the start of file entry is used to mark the file as deleted.
• The contents of file still remain on disk.
• The contents can be recovered by placing a valid file name, character in place of E5 and then recovering the chain of file in FAT.
• If somehow the clusters used by deleted file has been overwritten by some other file, it cannot be recovered.

5) Structure of Partitioning Table

• Total size of Partition Table is 512 bytes.
• First 446 bytes contains code which loads the boot block of active partition and is executed at Boot Time.
• Rest of the 66 bytes is the Data part.
• Last two bytes of the Data part is the Partition table signature.

6)Find root dir if reserved sector = 1 and size of fat is 9?

Root DIR Sector: reserved sectors +
2 * (size of FAT) = 1 + 2 * 9 = 19

7)write the functionality of absread and abswrite?

• absread( )
is used to read a block given its LSN
• abswrite( )
is used to write a block given its LSN
absread(int drive, int nsects, long lsec, void *buffer);
abswrite(int drive, int nsects, long lsec, void *buffer);

other question from old papers. Kindly pray for me :)

jin students ka paper ho gia ha wo plz paper share ker den jaldiiiii

mcq 80 % from moaaz file  and 10 from mid which is also given above moaaz file

  paper is v easy...

file size is 12k and cluster size is 4 is k shyd bloks find krne thy 2 marks

1st sector no formula 2 marks

segment*10h+ofset ye formula likhna tha 2 marks

1st user block no givn bloks per cluster is given find the sector. 2 maks eazy tha

formula put kr k valu put kr di but calculation ni ati thi hexa ki

name three descriptor table 3 marks

if LSN given then how to read a block 3 marks

wot is the purpose of control register in DMA 3 marks

address translation from logical to physical 3 marks

biosdisk limititions 5 marks

scan bad sector  5 marks

ntfs file system 5 marks

fat12,16 major difrence with fat 32  5 marks

Thx alot Wafa 

ap k wala sara mujy ata ha dua krna k mera b acha ho ameen

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