
Systems design
tracks is known as a
cylinder.
Each disk pack can store up to 250
megabytes
# Finally, the very largest computers might use fixed-head disks.
In such systems there is one head for each data track, thus
providing much faster access to data albeit at some expense.
The IBM 3380 houses two fixed disk spindles in each unit,
providing over 2.5 billion bytes of data. This is the equivalent
of the combined capacities of over 500 of the largest ex-
changeable disk packs.
Methods of file organization and processing
As we mentioned earlier, you will have to choose the most
appropriate methods of file organization if the computer system i ...