Data Transfer Rate is often measured in megabytes per seconds (MBps). In telecommunications, data transfer rate is the average number of bits (bitrate), characters or symbols (baud rate), or blocks (packet rate) per unit time passing between equipment in a data transmission system.
The units usually refer to the “effective” number of transfers, or transfers perceived from “outside” of a system or component, as opposed to the internal speed or rate of the clock of the system. One example is a computer bus running at double data rate where data is transferred on both the rising and falling edge of the clock signal. If its internal clock runs at 100 MHz, then the effective rate is 200 MT/s, because there are 100 million rising edges per second and 100 million falling edges per second of a clock signal running at 100 MHz.
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The hard disk was invented on September 13, 1956 by IBM team led by Rey Johnson (considered as “father” of the disk drive). Earlier hard disk drives were large and cumbersome devices.