Akai DR16 pro Operator's Manual Page 106

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12: Hard Disks
Page 97
Hard Disk Size
The total available recording time depends on the total size of all storage media — 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 sam-
pling frequency, less time is available. This is because higher sampling frequencies record more
samples onto disk. In turn, this provides a better audio bandwidth, but it also requires more stor-
age space.
The “1 Track” column shows how many track minutes are available with some typical sizes of hard
disk. A track minute indicates the total time available if only one track is recorded. The “16 Track”
column shows the amount of time that is available to each track, and is just the “1 Track” column
value divided by 16. For example, 1.2 GB at 48 kHz provides approximately 212 track minutes (3
hours 32 minutes), that is about 13 minutes per track. However, each track is not restricted to 13
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 track may use 32 minutes, another track 23 minutes, and so
forth.
Available Minutes:Seconds (Approx.)
Hard Disk Size 32 kHz 44.1 kHz 48 kHz
16 track 1 track 16 track 1 track 16 track 1 track
4 GB 66:24 1062:40 48:12 771:06 44:16 708:36
2 GB 33:12 531:20 24:06 385:33 22:08 354:18
1.2 GB 19:55 318:48 14:27 231:20 13:17 212:35
650 MB 10:47 172:41 7:50 125:18 7:12 115:08
330 MB 5:29 87:40 3:58 63:37 3:39 58:27
240 MB 3:59 63:46 2:53 46:16 2:39 42:31
128 MB 2:09 34:32 1:32 24:40 1:25 22:40
100 MB 1:40 26:34 1:12 19:16 1:06 17:42
Note:
There is no column for 44.056 kHz in the table above. You will find its disk utilization
values are very close to 44.1 kHz.
The DR16pro can record and play back a maximum of 24 consecutive hours per project
(23:59:59:00:0). It is not possible to record or play back beyond absolute time 24 hours
(midnight 0:00).
Note:
If you are handling a large quantity of data, the display may show the message
DISK SLOW”.
This is due to a DR16pro performance limitation. In this case, we recom-
mend that you use a faster hard disk or install “Wave Buffer Memory” (72 pin SIMM 32Mb
or 16Mb 60ns) on CPU Board.
SCSI
The DR16pro uses the SCSI connection format for connecting external hard disks. Pronounced
“scuzzy,” SCSI (Small Computer System Interface) is often used for connecting computer periph-
erals 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 DR16pro system, the DR16pro functions as the
controller, writing to and reading from the connected slaves.
For example, 16 bit recording:
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