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PDI is the name of the SCO SVR5 1 and 2 driver interface for storage devices. It is the predecessor of the SVR5 SDI. PDI drivers that conform to $interface sdi: 2 or higher and ddi: 5 or higher can be run on SVR5 without modification.
Administrative commands have been renamed (for example, the pdiadd command is now sdiadd), with links provided so that scripts that use the old name will function without modification.