I remember, Winchester technology mean head is sit when drive spindle
start or stopped, so 3350 drives have that landing zone, all most new hard
disk drive is Winchester technology and having landing zone.
But floppy 360rpm Vs 3600 to 10000 rpm hard disk drive is quite a
different construction,
Hard Disk drive seal with 100 clean room environment
and floppy is just regular environment.
And Also 3350 has CE track to test Read/Write Pack to test head
read write capability on Media and spare tracks to reassign bad tracks
I replace 3350 HDA (Hard Drive Assy?) couple of times
Boy it was over 10K two decades ago...

Retired IBM engineer.
Tom wrote in message <[log in to unmask]>...
>If I remember this from my mainframe days, the capacity is 2MB
>unformatted and 1.44 mb of formatted data. I remember from the old IBM
>3350 drives, a track could hold a max of 19069 bytes if you use one
>sector per track. Each extra sector per track takes away some space for
>"landing" zones. Fixed format drives (like floppies) have *lots* of
>landing zone space. Add in track addressing and that's where the
>difference in capacities goes.