Vulcan high-speed internal hard disks came in capacities of 20, 40, 100 and 200 MEGs, and replaced Apple's power supply with 70 watts of power and an integrated fan. 

Built-in firmware automatically installs itself as a Desk Accessory for write protection and partitioning. The flexible partitioning software can be easily adjusted for any of the operating systems, supporting 16 partitions, with up to four accessed simultaneously.  Compatible with II, II+, IIe, and IIgs.

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