Q-See QC444 Service Manual download pdf (Page 24)

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CHAPTER 5 HARD DISK DRIVE

PICTURE 5-3

PICTURE 5-4

PICTURE 5-5

PICTURE 5-7

PICTURE 5-6

PICTURE 5-8

STEP 4

. Line up hard drive mounting screws

with mounting holes at the bottom of the

DVR and slide the hard drive to move the

screws to the narrow part of th e holes.

STEP 5. Carefully turn DVR over taking care

not to allow the drive to slide out.

STEP 6. Tighten the mounting screws ﬁrmly.

STEP 7. Flip the DVR right side up and

connect the data and power cables to the

hard drive.

STEP 8. Replace the cover onto the DVR.

STEP 9. Secure the screws in the rear and

side panels.

5.2 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.

To determine the optimal capacity for your purposes, the chart below to estimate the size of hard drive that

you’ll need.

VIDEO

FORMAT

RESOLUTION FRAME

RATE

(FPS)

VIDEO

QUALITY

BIT

RATE

(kbps)

SPACE

USED

(MB/h)

NTSC CIF 30 Highest 1M 465

Higher 768k 297

Medium 512k 230

Low 384k 173

Lower 256k 115

Lowest 128k 56

D1 Highest 2M 910

Higher 1.5M 712

Medium 1M 468

Lower 768K 297

Lowest 512K 241

PAL CIF 25 Highest 1M 466

Higher 768k 295

Medium 512k 235

Low 384k 175

Lower 256k 112

Lowest 128k 56.4

D1 Highest 2M 915

Higher 1.5M 700

Medium 1M 465

Lower 768K 297

Lowest 512K 241

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:

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.

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