It is abnormal end or unplanned termination of a computer software process. Abend error occurs when a computer does not identify the directed instructions which need to be executed by the system. Errors or crashes on the Novell netware network operating system are usually called ABENDs.
Communities of NetWare administrators have sprung up around the Internet, such as abend organizations.
For example it happens caused by memory divergence or some other unidentifiable malfunction. Abend error also familiar as blow up, bomb or with crash words in computer science world.

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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.