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Cray X-MP
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==I/O subsystem== [[File:Cray DD49 - Musée des arts et métiers.jpg|upright|thumb|Cray DD-49]] The [[Input/Output]] (I/O) subsystem could have two to four I/O processors with a total of 2 to 32 disk storage units. The DD-39 and DD-49 hard drives made by [[Ibis (company)|Ibis]] with a raw transfer rate of 13.3 MB/s each stored 1200 megabyte (blocked and formatted) with 5.9 MB/s and 9.8 MB/s transfer rates (unstriped), respectively. Optional [[solid-state drive]]s were available with 256, 512 or 1024 MB capacities with transfer rates of 100 to 1,000 MB/s per channel. Up to 38 gigabytes of data storage was possible.<ref name=brochure /><ref name=brochure86>Cray Research, Inc. (1986). [http://www.craysupercomputers.com/downloads/CrayXMP/CrayXMP_Brochure001.pdf "The Cray X-MP Series of Computer Systems"].</ref> For [[magnetic tape]] I/O, the system could interface with [[IBM 3420]] and [[IBM 3480|3480]] tape units directly without a lot of CPU processing.<ref name=brochure86 />
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