Instead of truncating the number of cylinders to 1024, they use the cylinder count modulo 1024, which means that a 2300 cylinder drive will appear to have just 252 cylinders.
(they; use; the cylinder count modulo 1024) (a 2300 cylinder drive; to have; just 252 cylinders) (1024; means; that a 2300 cylinder drive will appear to have just 252 cylinders) Context(1024 means,List([90, 107))):(a 2300 cylinder drive; will appear; )
1024 means,List([90, 107))
they a 2300 cylinder drive 1024 a 2300 cylinder drive
use to have means will appear
the cylinder count modulo 1024
just 252 cylinders
that a 2300 cylinder drive will appear to have just 252 cylinders