ISDN stands for “Integrated Services Digital Network” are a telecommunications network that allows for data transmission, and digital voice, video. ISDN is a broadband Internet option. A typical ISDN connection can carry transfer rates of 64K or 128K of data per second. While these speeds are quicker than what you can get with a dial-up modem, the newer DSL technology can support even faster transfer rates and is less costly to set up and maintain.
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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.