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Portable Digital Recorders and Audio Workstations
Calculating the Amount of Recording Time for a Given Hard Disk Space
First, find the number of bytes per minute used during recording (for more information
see Calculating the Space Required to Store Digital Audio). Then, that number divided into the available hard disk space will give
recording time. Using the factors of sample rate and word length, calculate the
bit per second rate. Divide by 8 to convert to bytes per second. Then multiply
by 60 to convert to bytes per minute. Then the Byte/min. is divided into the free
space of the hard disk. The result is minutes of recording time with one track,
divide the time by the number of tracks for total multitrack time.
Example: Hard disk showing 540 MB (megabyte) free space. Recording a 16 track song using sample rate of 44,100 Hertz (44.1KHz) and word length of 16 bits.
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44,100 times 16 equals 705,600 bits per second
44,100 X 16 = 705,600 bits/sec.
705,600 divided by 8 equals 88,200 bytes per second.
705,600/8 = 88,200 bytes/sec
88,200 times 60 (seconds in a minute) equals 5,292,000 (5.292 X 10^6) bytes per minute.
88,200 X 60 = 5.292 MB/min
Disk space of 540,000,000 (540MB) divided by 5,292,000 equals recording time of 102 minutes for one track.
540MB/5.292MB = 102 min/track
102 divided by 16 (tracks) equals 6.38 minutes total time available for recording 16 tracks of 16 bits at 44.1KHz sample rate.
102/16=6.38
