Instruction manual

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50
Uncompressed data rates for capture and playback
The data rates for uncompressed video are quite high, and listed below are minimum recommended disk
requirements for uncompressed standard definition and high definition video.
Uncompressed 8 bit Video
Standard Definition 4:2:2
Frame Size MB per second MB per minute GB per hour
720x486/29.97fps (NTSC)
21.5 1288 75.5
720x576/25fps (PAL)
21.2 1274.4 75
High Definition
1280x720p/59.94fps
106.8 6409.7 375.6
1920x1080/50i
100.3 6020.5 352.8
1920x1080/59.94i
120 7199.9 421.9
Uncompressed 10 bit YUV (4:2:2)
Standard Definition
Frame Size MB per second MB per minute GB per hour
720x486/29.97fps 27 1 600 94
720x576/25fps 26 1 582 93
High Definition
1280x720p/60fps 141 8 438 494
1920x1080/24PsF 127 7 594 445
1920x1080/50i 132 7 910 463
1920x1080/60i 158 9 482 556
When calculating the data rates required for your disk system, it is a good idea to add a safety margin due
to fluctuations in disk speed caused by disk seek time. Disk speeds can be increased by adding more disks.
Serial ATA (SATA) disks can reduce to half their speed as they become full, so in a 2-disk SATA array you
should aim for a 100% safety margin. In an 8-disk SATA array, a 30% safety margin should be adequate. SCSI
disk arrays seem to display less fluctuation and so a 20% safety margin should be adequate for an 8-disk
SCSI array. Generally the more disks in the array, the better.