5-1/2" hard drive with massive capacity to fit in 5-1/2" optical slot

WD Internal Drives Internal Drives
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I have generated a sample drive in Solid Works with 2 stacks of 12 platters that results in a 48 head drive with 3 1/2 inch platters. A 96 head drive with 4 stacks of 2.5 inch platters would also fit in a full size / full height drive enclosure. The heads are mounted on opposing arms so they all move together. An X shaped arm could position 96 heads on 4 stacks of twelve 2.5 inch platters. That would provide about 3,480MB/Sec if ran at VelociRaptor rates. The drive could also spin much slower and still provide fast results with longer lifespan. Also RAID could be built into the drive.