Russ Gilbert writes:
If you’re talking standard computer store, you can’t use those 5 1/4" disks.
I mean you can’t use high density disks. They must be double density to use
with the 1050. Almost all double density 5 1/4" disks have a hub ring, high
density disks don’t have the hub ring.
RHamiIton5 elaborates: (5/12/01)
The Atari 8 drives do not have write heads and circuity which can handle the
type of oxide coating used on the high density floppy media; they cannot write
reliably to them. The hub ring has just become a sort of marker to distinguish
the high density from the standard double density diskettes.
Way back in your apple days of 㥗-㥚, most disks were hubless and only the
really premium brands offered hubs to prevent slippage and out of round
problems; you could even buy little kits for adding you own hub rings.
When the home computer swell really hit around 㥛 and price wars began, hub
rings became common on good disks and eventually became standard down to
include most generic bargain diskettes.
The introduction of high density 5.25’s required a different coercivity (=
magnetizability) to get more bits in a smaller space and suitable electronics
to do it. These disks were produced hubless; was it a differentiating label or
just unnecessary because of stronger mylar construction? Anyone?