Q-See QT426 Manual Do Utilizador
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CHAPTER 9 HARD DISK DRIVE
STEP 4
. Connect the power and data cables.
Press firmly, but do not force them onto
the pins or you may damage them. The
connectors are “keyed” to ensure they are
connected in the proper position.
the pins or you may damage them. The
connectors are “keyed” to ensure they are
connected in the proper position.
STEP 5.
Attach hard drive to the base of the
DVR with screws using the four mounting
holes.
holes.
STEP 6.
Replace the DVR cover and secure.
DATA
CABLE
POWER
CABLE
HARD DRIVE
HARD DRIVE
MOUNTING HOLES
FOR HARD DRIVE
PICTURE 7-3
7.2 CALCULATING THE RECORDING CAPACITY OF A
HARD DISK DRIVE
While the physical data capacity of a hard drive is fixed, how much video you can record upon it depends
on your recording configurations. Higher quality recordings will take up more space on the drive and setting
the DVR to record for more frequently will fill it up more rapidly.
on your recording configurations. Higher quality recordings will take up more space on the drive and setting
the DVR to record for more frequently will fill it up more rapidly.
To determine the optimal capacity for your purposes, the chart below to estimate the size of hard drive that
you’ll need.
you’ll need.
VIDEO
FORMAT
RESOLUTION
FRAME
RATE
(FPS)
VIDEO
QUALITY
BIT
RATE
(kbps)
SPACE
USED
(MB/h)
NTSC
CIF
30
Highest
1000k
465
Higher
768k
297
Medium
512k
230
Low
384k
173
Lower
256k
115
Lowest
128k
56
D1
7.5
Highest
500k
228
Higher
375k
128
Medium
250k
117
Lower
192k
75
Lowest
128k
61
PAL
CIF
25
Highest
1000k
466
Higher
768k
295
Medium
512k
235
Low
384k
175
Lower
256k
112
Lowest
128k
56.4
D1
7.5
Highest
500k
228
Higher
375k
128
Medium
250k
117
Lower
192k
75
Lowest
128k
61
The formula for calculating the required disk space is:
Total Recording Capacity = Used space per hour (MB/h) x Recording time (hour) x
number of channels
Example: A customer is using the NTSC format (30 frames per second), CIF resolution
with video quality set to Lowest and a total of 16 Channels. He wants the unit to record
continuously for a month. Therefore, the calculation will look like this:
Total Recording Capacity = Used space per hour (MB/h) x Recording time (hour) x
number of channels
Example: A customer is using the NTSC format (30 frames per second), CIF resolution
with video quality set to Lowest and a total of 16 Channels. He wants the unit to record
continuously for a month. Therefore, the calculation will look like this:
56(MB/h), x 24 (hours/day) x 30 (days) x 16 (channels) = 645,120MB or 650GB
Installing a 750GB SATA hard drive should provide enough space for one month’s continuous
recording time at those settings.
recording time at those settings.