I/O Subsystem
The 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 with a raw transfer rate of 13.3 MB/s each stored 1.2 GB (blocked and formatted) with 5.9 MB/s and 9.8 MB/s transfer rates (unstriped), respectively. Optional solid state drives were available with 256, 512 or 1024 MB capacities with transfer rates of 100 to 1,000 MB/s per channel.
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