Backup Via Scsl-B Bus - Akai DR4vr Operator's Manual

82 Chapter
1
1 :
Backup
Backup
via
SCSI-B Bus
Installing
an
optional IB-
11
1
S
SCSI
Interface board allows
you
to
save
and
load your audio
data
to
and from an
external
MO
drive or hard disk via the
SCSI-B
bus.
Since an external control protocol
is
supported,
you can
use
waveform
editing software
on
an
external computer.
Connection
&
Setup
Warning:
Make
sure
that the
DR4vr and
the external
backup
devices are
powered
off before
making any
connections.
Do
not connect or disconnect
SCSI
cables while a device
is
powered
on.
1 )
Use a
SCSI
cable
to
connect
either of
ttie
two
SCSI-B connectors
on
tt>e
IB-lllSto the
SCSI
connector on
the external
backup
device.
Use
only high-quality
SCSI
cables with a
maximum
length of
six meters.
2)
Terminate the SCSI-B bus
and
set
the SCSI
ID
numbers.
The
illustration
below shows
how
to set the termination
and
SCSI ID number
on
the
DR4vr
rear panel.
Refer
to the instruction
manuals
supplied with
the external
backup
device
for
details
about
setting
its
termination
and SCSI ID
number.
The
first
and
last
devices
on
the
SCSI-B
bus should
be
terminated.
Assign an
exclusive
SCSI
!D number
to
each device
(0 to
7).
DR4vr
rear
panel
SCSI-B
switch
ID
Terminator
ON
OFF
The
initial
DR4vr
settings are:
Termination:
OFF
ID number: 0
1
2 4
0
OFF OFF OFF
1
ON OFF
OFF
2
OFF ON
OFF
3
ON
ON
OFF
4
OFF OFF ON
5
ON
OFF ON
6
OFF ON ON
7
ON
ON ON
3)
Power up
the external
backup
devicd, then the
DR4vr.
Do
not
power up
the DR4vr
first.
4)
Format
the
extemal backup
device.
Use
512byte/block or 1024byte/block.
If
you're backing up
to
a hard
disk,
use one with
a capacity greater than the hard
disk
used by
the
DR4vr
for recording.
The
following formula can be used
to calculate
approximate
recording
and backup
capacities:
The
space
required
for
one minute of audio data
at
a sampling frequency of
48 kHz
is:
48000Hz X
2 bytes
x
60 seconds
= 5.76MB
So
a capacity of approximately
24MB
is
required for one minute
of
4
channel back
up.
Backing
Up
to
an
External
MO
or
Hard
Disk
We
recommend
that
you format
the
extemal backup
device
(MO
disk or hard
disk)
with
the
DR4vr
even
if
it
is
brand
new
or has been
formatted using
a different device.
You
can back up one
unit of
sound
data
on one
3.5
inch
MO
disk,
one
side
of
a double-sided
MO
disk,
or
one
hard
disk.
A
unit of
sound
data can be
specified using the in/out
points.
Version 4.0 12/95