(ASPI) A set of libraries designed to provide programs running under Microsoft Windows with a consistent interface for accessing SCSI devices. ASPI has become a de facto standard. The ASPI layer is a collection of programs (DLLs) that together implement the ASPI interface. Many problems are caused by device manufacturers packaging incomplete sets of these DLLs with their hardware, often with incorrect date stamps, causing newer versions to get replaced with old. ASPICHK from Adaptec will check the ASPI components installed on a computer. The latest ASPI layer as of March 1999 is 1014. The ATAPI standard for IDE devices makes them look to the system like SCSI devices and allows them to work through ASPI.