History (1988): RAID-5 Patent

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1988: RAID-5 Patent
RAID-5 is one of the dominant redundancy strategies used.

Why it’s important
US 4,761,785 patent Parity Spreading To Enhance Storage Access filed by Clark et al of IBM in 1986 patented the technology that is RAID-5 As of late 2017 it was cited in 398 subsequent patents. It issued in August 1988.

Discussion:
IBM implemented RAID-5 well after the filing date, first in AS400 software in the early 1990s and then in 1992 as a hardware implementation in the 9337 disk storage subsystem.