Consider a file currently on a disk that has both logical and physical

block sizes of $512$ bytes. Assume that the information about each file

is already in memory. For each of the three allocation strategies

$($contiguous$,$ linked, and indexed$),$ answer the following questions:

$($a$)$ How is the logical$-$to$-$physical address mapping accomplished

in this system $?($For the indexed allocation, assume that a fie is

always less than $512$ blocks long$)$

$($b$)$ If we are currently at logical block $12($the last block accessed

was block $12)$ and we want to access logical block $5,$ how many

physical blocks must be read from the disk $?$