17 Sep
2003
17 Sep
'03
3:25 p.m.
On Wed, 17 Sep 2003, Nico de Jong wrote:
I just checked some of mine, and there is not really "conclusive evidence". On
top of that, some SSSD floppies were rejected DSDD's. The good thing is, that I've
never seen a double sided that couldnt be used as single sided. The story behind this is
rather remarkable: when we talk about 3740 floppies (i.e. IBM labelled), the f?rst track
is always written as single-side single-density, as some drives and/or systems can detect
the disk format and/or re-assign defective tracks. So, selling "unknowns" as
SSSD should be safe, and if they get a DSSD or DSDD (yes, they exist!), they were just
lucky.
Nico
Quite the contrary! A quick glance at an 8" disk will tell you
its density by the position of the index aperature in the disk
jacket. A Single Sided disk has the aperature 7 degrees clockwise
of the 12 o'clock position, while a Double Sided disk has it
located 26 degrees clockwise of the 12 o'clock position.
In other words, SS is at about 1202 and DS is about 1307 hours.
- don
A hint : sort the floppies according to density. I
would be rather p.....
if I bought a stack of 20 floppies, believing they were DSDD, and I got
some SSSD ones.
Is there a way to tell visually if they are DS vs SS? Not all the
floppies have their original factory labels on them any more, and I know
there are some of each.