One
of
the
read/write channels
is
optimized
to
transfer data
to
and
from
the
media at 500kHz,
the
other channel
is
optimized
to
transfer data
to
and from
the
media at 300kHz. The 500kHz
channel
is
designed
to
be used
with
HP92190X High-Capacity
96
tpi
Discs.
HP92190X
is
a high coercivity (approximately 650
Oersteds) media. When this drive
is
used
with
HP921
90X media,
1.2MB
of
formatted data can be stored and read.
The 300kHz channel
is
designed
to
be
used
with
HP921
90A
Double-Sided Double-Density
Discs.
Because
the
bit storage
density
of
the
HP921
90A
disc
is
not
as
high
as
HP921
90X discs,
when this media
is
used
in
the
1.2MB drive, the flexible disc
controller enables the 300kHz channel and
issues
double
STEP
pulses
to
the
drive. (Refer
to
Section 2
for
detailed information on
the flexible disc controller subsystem.)
As
a result,
the
1.2MB
Internal Flexible
Disc
Drive can
format
and write a Double-Sided
Double-Density
Disc
in
a similar way
as
the 360KB Internal Flexible
Disc
Drive. However, since the read/write gap
is
half
as
wide
as
the gap
in
the
360KB Internal Flexible
Disc
Drive head,
the
360KB
Internal Flexible
Disc
Drive and other similar drives cannot read
the
signal on these smaller tracks.
Media
Note the following when using
the
1.2MB Internal Flexible
Disc
Drive:
•
Use
of
HP921
90X High-Capacity
Discs
will result in maximum
storage capacity.
• HP92190X High-Capacity
Discs
are designed
to
be
used only
with
the
1.2MB Internal Flexible
Disc
Drive. They will
not
work
in
the
360KB Internal Flexible
Disc
Drive. *
• The 1.2MB Internal Flexible
Disc
Drive
can
read and write data
with
HP92190A Double-Sided
Discs.
After
being
used
in
the
1
.2
drive,
the
discs
will
not
be able
to
be
read
or
written on
the
360KB Internal Flexible
Disc
Drive because
of
the
narrower track.
**
106 Disc Drives
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