Whether installing the drive for the first time or removing the old one to install a new one, the steps are largely the same:
STEP 1. Disconnect the DVR from the power source as well as any other connections.
STEP 2. Remove the screw from the hard drive cover. The cover will slide upward for removal.
PICTURE
STEP 3. Slide out the old drive (if present). Insert the new drive into the slot and slide into position. It should fit snugly into the connectors at the bottom. DO NOT FORCE! If the drive does not fit firmly, remove, check alignment and reinstall.
PICTURE
STEP 4. Replace the hard drive cover.
8.2CALCULATING 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 | RESOLUTION | FRAME | VIDEO | BIT | SPACE |
FORMAT |
| RATE | QUALITY | RATE | USED |
|
| (FPS) |
| (kbps) | (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.
CHAPTER 8 HARD DISK DRIVE
60 | 61 |
