Question

ii) Differentiate Seek Time and Access Time.​

Answer 1

Answer:

Answer:-

Explanation:

1. Access Time:

Access Time is defined as the setup time before the actual data transfer takes place.

For example, the read/write head is on track 1 but we need to read data from another track or segment. Thus, the read/write head will move to the data block location before the actual transfer can take place. This delay is called Access Time.

Access Time is calculated by summation of the following:

(a). Seek Time

(b). Rotational Latency

(c). Command Processing Time

(d). Settle Time

These are explained as following below in brief.

(a). Seek Time –

It is the time required by the read/write head to move from the current track to the requested track.

Seek Time

= (Number of tracks/cylinders crossed) * (Time to cross one track/cylinder)

(b). Rotational Latency –

It is the time required by the read/write head to move from the current sector to the requested sector.

Rotational Latency

= (Angle by which disk is rotated) / (Angul)

Answer 2

Answer:

Seek Time:

It is defined as the time required by the read/write head to move from one track to another

Access Time:

It is defined as the setup time before the actual data transfer takes place

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