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- Newsgroups: comp.os.cpm
- Path: sparky!uunet!haven.umd.edu!darwin.sura.net!cs.ucf.edu!tarpit!bilver!bill
- From: bill@bilver.uucp (Bill Vermillion)
- Subject: Re: 720K 5-1/4" diskettes
- Organization: W. J. Vermillion - Winter Park, FL
- Date: Sat, 5 Sep 1992 23:51:58 GMT
- Message-ID: <1992Sep5.235158.15422@bilver.uucp>
- References: <".2-Sep-92..8: 36:48.EDT".*.Michael_D._Sprague.wbst311@Xerox.com> <Bu2K2r.6oy@acsu.buffalo.edu> <1992Sep4.215455.5222@news2.cis.umn.edu>
- Lines: 34
-
- In article <1992Sep4.215455.5222@news2.cis.umn.edu> lemay@epx.cis.umn.edu (Lawrence LeMay) writes:
-
- >Apparently some of these 'quad' density disk drives are sensitive about NOT
- >having hub rings on the floppy. You will notice that High-Density floppies
- >do not have these rings...
-
- >So, is there a source of fairly high quality DS/DD floppies WITHOUT hub rings,
- >for those of us that plan to format and use these disks as if they were Quad
- >density disks?
-
- Hub rings have nothing to do with the density, capacity, etc.
-
- The reason hub rings are not needed on the high-density drives, is that
- the drive spins on inserting the disk. The hub motion is
- self-centering because of the rotation.
-
- The older designed drives, the full-height ones, used varying tapers on
- the clamping cones. These drives did NOT rotate upon insertion, and
- the hub rings were the added re-inforcment to keep the center holes of
- the disks from crimping.
-
- You could really crunch the older disks too, as the drive was done via
- a belt and you could really get some torque going in comparison to the
- direct drive units.
-
- I had disks (in the 1979/80) era that would spin in the full height
- drives, but would not in the half-height direct drive units.
-
-
- --
- Bill Vermillion - bill@bilver.oau.org bill.vermillion@oau.org
- - bill@bilver.uucp
- - ..!{peora|ge-dab|tous|tarpit}!bilver!bill
-
-