Comelit 49163, Manual

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6.4 Recording Length
Estimate record time base on 120G Byte HD (Quad Mode). Unit : Hour
User can calculate an estimate record hours by below formula:
HDD capacity (G Byte) x 1024 (M Byte) x 1024 (K Byte)
X (K Byte/frame) x Y (frame/sec.) x 60 (sec.) x 60 (min.)
For example (PAL):
HDD 120G Byte @ 6 frames per second @ Normal quality
120 (G Byte) x 1024 (M Byte) x 1024 (K Byte)
15 (K Byte/frame) x 6 (frame/sec.) x 60 (sec.) x 60 (min.)
estimate hours are 388
Format Quality
↓
Frame Rate (Y) 25 12 6 1
HIGH (X= 20 kB/frame) 70 146 291 1748
NORMAL (X= 15 kB/frame) 93 194 388 2330
PAL
LOW (X= 12 kB/frame) 117 243 485 2913
Format Quality
↓
Frame Rate (Y) 30 15 7 1
HIGH (X= 20 kB/frame) 58 117 251 1748
NORMAL (X= 15 kB/frame) 78 155 333 2330
NTSC
LOW (X= 12 kB/frame) 97 194 416 2913