10,138,170,178,180,181,185,201,265,521 should be sequence of access if head is at 180 th track...
Let suppose head is at 512th
So sequence should be ..
171,427,491,507,511,512,514,522,554,684,1194
So ans should be 11...
If same type of question has been asked ...I think we can do it directly... 2028 =2^11..so 11 is the ans...with the condition head can start from any point...