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Choosing MO Disks
7
D24—Owner’s Manual
The following table lists the approximate recording times available using 640 MB MO
disks at a variety of recording resolutions and sampling rates.
Higher recording resolutions and sampling rates offer higher quality, but produce more
data, which reduces the total available recording time. Use the Remain function to
check the available recording time. See “Checking the Time Remaining” on page 38 for
more information.
The number of tracks available for simultaneous recording can be expanded using mul-
tiple D24s. See “Multiple D24s” on page 144 for more information.
The D24’s internal MO disk drive supports 230 MB, 540 MB, and 640 MB MO disks.
See the Yamaha Professional Audio Web site at the address below for up-to-date news
on MO disks.
<http://www.yamaha.co.jp/product/proaudio/homeenglish/>
Preformatted MO Disks
MO disks preformatted for use with PC or Macintosh computers can be used with the
D24, but require formatting before use. See “Formatting MO Disks” on page 26 for
more information.
Calculating the approximate Recording Time
You can calculate the approximate recording time for a given recording resolution,
sampling rate, and disk capacity as follows. First multiple the recording resolution by
the sampling rate to get the number of bits produced per second (e.g., 16
×
44100 =
705,600 bits per second). Then divide that by eight to get the number of bytes per sec-
ond (e.g., 705,600
÷
8 = 88,200 bytes per second). Multiply that by 60 to get the number
of bytes required per minute (e.g., 88,200
×
60 = 5,292,000 bytes per minute, or 5.292
MB/min). Now you know the number of megabytes required to store one minute of
audio data, simply divide the capacity of the disk by that number to get the approximate
number of track minutes (e.g., 640,000,000
÷ 5,292,000 = 120 minutes). Finally, divide
the number of track minutes by two, four, or eight to get the approximate recording
time available for several tracks (e.g., 120 ÷ 8 = 15 minutes for 8-track simultaneous
recording).
Bit
Sampling
Rate
Track minutes
(mono)
2 tracks 4 tracks 8 tracks
16
44.1 kHz
120 min 60 min 30 min 15 min
48 kHz
111 min 55 min 27 min 13 min
88.2 kHz
60 min 30 min 15 min —
96 kHz
55 min 27 min 13 min —
20
44.1 kHz
96 min 48 min 24 min 12 min
48 kHz
88 min 44 min 22 min 11 min
88.2 kHz
48 min 24 min 12 min —
96 kHz
44 min 22 min 11 min —
24
44.1 kHz
80 min 40 min 20 min 10 min
48 kHz
74 min 37 min 18 min 9 min
88.2 kHz
40 min 20 min 10 min —
96 kHz
37 min 18 min 9 min —