Q-See QT528 - Manual (Page 94)

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Appendix B Calculate Recording Capacity (D1)
Users can calculate the size of hard disk according to the saving time and DVR recording settings. The DVR
uses fixed video bit rate. The below are the details at different settings.
Video Format
Resoluti
on Frame Rate
Totally(FPS)
Video Quality
Bit Rate
(kbps)
Used
Space(MB/h)
PAL D1 25
Highest 2M 915
Higher 1.5M 700
Medium 1M 465
Lower 768K 297
Lowest 512K 241
NTSC D1 30
Highest 2M 910
Higher 1.5M 712
Medium 1M 468
Lower 768K 297
Lowest 512K 241
The calculation format is:
Total Recording capacity =Used space per hour (MB/h) (coverage rate of hard disk) × recording time
(hour) ×channel numbers
For instance, one customer uses PAL cameras, set resolution to D1, video quality to Higher, frame rate to 25 fps
for enabling total 4 channels. He wants the unit to record continuously in a month. Below is the calculation:
Total Recoding capacity =700 (mb/h) X 24(hours/day) X30(days) X4(channels)= 2016000(MB)
≈2016(GB)
Therefore, customers just install two SATA HDDs with 1000GB, it can almost record for one month.