question about unix file system

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# 1  
Old 09-08-2011
question about unix file system

The file system unix use a multilevel indexes access to disk, 12 direct blocks, 1 single indirect block, 1 double indirect block, 1 triple indirect block:
Assuming a:
block = 512 bytes,
pointer = 4 byte,
and there is a file of 200 blocks,
how many disk access is needed to read the block number 13 with direct disk access?
And how many disk access is needed to read this file sequentially form first block to 150?

I think that is needed 1 disk access to read the block 13 and 150 disk accesses to read the file sequentially.

Is it right?
# 2  
Old 09-08-2011
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