CORRECTION:
SOME (NOT ALL) 5.25" drives switched back and
forth between 300 and
SOME (NOT ALL) "1.2M" drives switched back and forth
between 300 and
360RPM, requiring 250K and 500K bits per second.
SOME (NOT ALL) 5.25" drives stayed at 300RPM,
requiring 300K and 500K
SOME (NOT ALL) "1.2M" drives stayed at 360RPM,
requiring 300K and 500K
bits per second.
"360K" drives were 300 RPM, requiring 250K bits per second