I need help with the following questions Question 1 what sep

I need help with the following questions

Question 1: what separates a disk head from the disk surface? :=)

Question 2: A server disk has 12 platters, 512 data bytes per sector, an average of 128 tracks per sector and 4,096 cylinders.

a)How many bytes are in a Gigabyte (GB)? (express as a power of 2)

My answer: 1GB=2^30 bytes

b)Express in Gigabytes to 4 significant digits the size of this disk

My answer: 12*512*128*4096=3,221,225,472 = 2^32

Please help me with the first question and make sure my second question is correct

thanks

Solution

1) Disk surface is overall area which is further divided into tracks and those are further divided into sectors.

And disk head is individual separate for each track using which computer is able to switch from one track to another. But using this arrangement needs too many heads which makes it very expensive.

2) a) 1 KB = 1024 byte
1 MB = 1024 KB i.e 1024 *1024 byte
1 GB = 1024 MB i.e 1024 *1024*1024

1 GB = 1073741824 which is 2^30 bytes