$($b$)$ Two analyses can be conducted when there is an event and failure occurs $-$ Event Tree Analysis $($ETA$)$ and Fault Tree Analysis $($FTA$).$ For the hard disc failure to read data, the following details are noted, in Fig. $2$ showing the whole construction of hard disc.

A$.$ Initiating Event: Failure Read Data

B$.$ Top Failure: Read Data Failure

$($i$)$ Illustrate through example the ETA and FTA.

Fig. $2$: Hard Disc Drive Construction