Hard Disk Size; Scsi; Scsl-A & Scsi-B - Akai DR4vr Operator's Manual

70
Chapter
10;
Hard Disks
Hard
Disk Size
The
total
available
recording time
depends on
the
total
size of
all
storage
media
—
that
is,
the
internal
hard
disk
and any
external
hard
disks
connected
via the
SCSI-A
bus.
As
can be seen
from
the table below,
the
sampling frequency
also affects the available time. Basically, with a
higher sampling
frequency,
less
time
is
available. This
is
because higher sampling frequencies
provide
a better audio bandwidth,
which
in
turn requires
more
storage space.
The "1
Channel" column shows
how many
channel minutes
are available with
some
typical
sizes of hard
disk.
A
channel minute
indicates the
total
time
available
if
only
one
channel
is
recorded.
The
"4
Channel" column shows
the
amount
of time
that
is
available to
each channel,
and
is
just the "1
Channel"
column
value divided by
four.
For example,
100MB
at
48 kHz
provides 17 channel minutes,
that's
about
4.2
minutes
per channel.
However,
each channel
is
not
restricted to 4.2
minutes, and can
use
as
much
or
as
little
of
the available storage
media
as
required
until
it
has
all
been
used. So, for example, one channel
may
use 8 minutes, another
channel
3 minutes, another 5 minutes, and
the
last
channel
1
minute.
Hard
Disk Size
Available
Minutes:Seconds
(Approx.)
32
kHz
44.1
kHz
48
kHz
4 Channel
1
Channel 4 Channel
1
Channel 4 Channel
1
Channel
4GB
265:40
1062:40 192:46 771:06
177:09 708:36
2GB
132:50
531:20 96:23 385:33
88:34 354:18
1.2GB
79:42 318:48 57:50
231:20
53:8
212:35
6501MB 43:10
172:41 31:19 125:18
28:47 115:8
330MB
21:55 87:40
15:64 63:37
14:36 58:27
240MB
15:56
63:46 11:34
46:16 10:37
42:31
128MB
8:30 34:32
6;10 24:40 5:40
22:40
100MB
6:38 26:34
4:49 19:16
4:25 17:42
88MB
5:50 23:22
4:14 16:57
3:53 15:35
44MB
2:55
11:41 2:07
8:28
1:56 7:47
Theoreticainy,
artiaximum of
64GB
of hard
disk
can be connected
to
the
DR4vr. However,
the
DR4vr
cannot record and playback more
than
24
hours
worth of
material (23:59:59:00).
SCSI
The DR4vr
uses the
SCSI
connection format
for connecting
external
hard
disks.
Pronounced
"scuzzy",
SCSI
(Small
Computer System
Interface)
is
often
used
for
connecting computer
peripherals
such
as
hard
disks,
scanners,
etc.
It
provides a
relatively
fast
data
transfer
rate,
making
it
ideal for digital
audio
applications.
Up
to eight devices can
be connected
in a
SCSI
daisy chain.
One
device
acts as the controller,
and
the others as slaves.
The
controller can
communicate
with
any
slave device. Typically, the
Slave devices
communicate
with
the controller
only. In a
DR4vr
system, the
DR4vr
functions
as
the controller, writing
to
and
reading
from
the connected
slaves.
SCSi-A
&
SCSI-B
The
DR4vr
has
two SCSI
buses;
SCSI-A
and SCSI-B. The SCSI-A
bus
is
used
to
connect
external
hard
disks
for
recording.
The SCSI-B
bus
is
for
backing up
to
an
MO
disk
and
connecting
to personal computers.
The
optional IB-
1 1 1
S
interface
card
must
be
installed to
use
the
SCSI-B
bus.
Versiffli
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