Olivetti 3MB ST506-interface drive?

Fred Cisin cisin at xenosoft.com
Sun Mar 13 17:13:27 CDT 2016


Is that "3MB" FORMATTED, or UNFORMATTED capacity?

"10MB" (ST412) was 12MB unformatted, with 306 cylinders and 4 heads.
"5MB" (ST406) was 6MB unformatted, with 306 cylinders and 2 heads. or was 
it (St506?) 153 cylinders with 4 heads?


In any case, using half as many heads/surfaces would create an "ST503" 
drive.  about 2.5M formatted capacity.




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