self doubt

Question

Suppose a file F of size 16KB is shared by 100 processes, each process read the entire F 10 timessequentially, disk uses linked allocation policy to store both Inode and data of the file with block size512byte in FAT and Block Pointer takes 4bytes. The number of disk block access related to access thefile F in executing all the 100 processes is :

Ans. 34

Answer 1

Follow.

Comments

what it mean(follow).

Answer 2

As disk uses linked allocation for storing blocks, no extra blocks for FAT are needed. It needs to access Inode table from the disk and there are ceil [16KB/(512-4)] = 33 spanned block need to access to load the whole file F sequentially .

So total = 33+1 (Access the Inode) = 34.

Once the file loaded to memory by any one processs, we do not need to access hard disk block as the file F is shared by other 99 processes.