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Question

consider unspanned blocking with 20 byte blocks. A file contains records of sizes 2,5,3,7,4,20 bytes.

the percentage of space wasted if blocks are allocated for file is?

my answer is 47.5.but they are given 31.66.please explain it.

Answer 1

1​​​s​t 20 byte block 2,5,3,7 -> 3B wastage

2nd block   4,  -> 16B wastage

3rd block  20 -> 0B  wastage

total byte = 60B

So %Space waste = (19/60)*100= 0.316631*100 = 31.66%

Comments

my mistake,got it. Actually i am not seeing the last 20 bytes.

thanks.