The process of accessing data has 4 steps.
4. Data transfer
|Step||Measured as:||Click to start and stop animations|
move the read/write head to proper track
rotate disk under the head to the correct sector
head lowers to disk;
wait for vibrations from moving to stop
(actually touches only on floppies)
|4. data transfer
copy data to main memory
|data transfer rate
where ms stands for millisecond = .001 second and kbit/s is kilobits per second. Historically, one kbit has always been 1000 bits instead of 1024 bits. Go figure!
|for floppies,||175 - 300 ms|
|for hard drive,||15 - 80 ms|
| new hard
|.0032 ms (at 300
MB per sec).
This is seriously fast!!
Clearly, getting data from a hard disk is immensely faster than from a floppy.