Re: High and Double density floppies

[dave@clark.net (Dave D)]

In article <2kc21q$kh@charm.magnus.acs.ohio-state.edu>,
Victoria M Althoff <valthoff@magnus.acs.ohio-state.edu> wrote:
>My understanding is that the substrate of the high-density disks is exactly the
>same as on double/single density disks.  In fact, the Disk ][ is quite happy 
>with single density disks that no one has used (or been able to buy) for years.
> Okay, so if the substrate is the same, then print-through (cited by someone 
>from AOL) should not be an issue.

I'm not sure what you mean by "substrate," but my understanding of the
difference between high-density and low-density disks is that the high-
density disks have smaller magnetic particles.  As a result, the Disk II
is unable to read what it has written, because the magnetic particles don't
make enough of an impression, if you will.

>
>Also, since the disk format is applied by the disk drive, differences between 
>PC and Apple write format should not be an issue.

Yeah, but most HD disks sold nowadays are preformatted, which can confuse
some formatting software..  (OK, okay, I know better than to think that
INIT should notice...)

And yes, years ago when this question bothered me I did try it..  Nope,
couldn't format my pricey new high-density floppy...

Dave