Acard ADR-7216 Manual de usuario descargar pdf (Pagina 4)

The Era of D1 Resolution Has Arrived

DVRs have become increasingly popular within the cities

and even among households. With the advancement of

technology, D1 (720 x 480 pixel) or MegaPixel DVR systems

will become one of the hottest specifications this year. D1

resolution is 4 times higher than the existing CIF (320 x 240

pixel), therefore, even the finest details, such as faces, li-

cense plates

, etc. can be seen even clearer.

Expansion of DVR Storage System

As the DVR is upgraded to D1 resolution, the amount of storage capacity needed for recording

also doubles, e.g. if a 16ch DVR with 1 TB HDD records continuously for 24 hours, it can record

roughly 16 days under CIF, but less than 7 days using D1. As for the relationship between resolu-

tion and storage, it is apparent that D1 class DVR

s requires much larger storage space.

The standard configuration for a 16ch DVR system on the market today is usually 2 ~ 4 built-in

HDD. If lengthy storage of video recordings is needed, then aside from changing HDD, the best

way is to use an external storage device. That is the reason why professional grade DVRs are

mostly configured with expansion interfaces such as USB or eSATA.

The DVR and its

external storage system come together as one. When choosing a DVR, the fol-

lowing technical specifications should be carefully noted.

The DVR’s Storage Requirements

First of all, one must understand the role of the DVR is to

preserve important video information. If the images of im-

portant moments cannot be provided, then there is no val-

ue in keeping it. The requirements for DVR storage include

liability, data security, efficiency, and recording time.

The importance of DVR storage subsystems are reliability, data protection, efficacy, expansion,

and compatibility. In terms of reliability, DVRs are in continuous operation 24 hours a day, 7 days

a week, 365 days a year, therefore, the reliability of the system is absolutely of top priority. Hence,

the demand for a reliable storage system is

no less than for a server. As for data protection, it de-

pends upon the site being monitored. The important place like bank, recording cannot be dis-

rupted or data lost due to storage system malfunctions. For efficacy, an efficient storage device

can help keep the DVR recording or video playback from stopping. Finally, there is a positive

correlation between recording time and storage volume. DV

Rs must have the flexibility for exter-

nal storage expansion in order to be able to make adjustments for video storage time.

• Reliability

Presently, USB and eSATAs are the main DVR external interfaces. The reli-

ability and multitasking ability of the eSATA is better than the USB, and is

therefore recommended for storage expansion. In addition, the eSATA

interface on the DVR and storage devices mus

t meet the electrical char-

acteristics set by the standard organizations. Also use cables that are EMI

resistant to attain stable data transmission.

06 07

Technical Column

To achieve 24/7 operations, professional grade products are still the main line for reliable storage

devices. The consumer storage devices are mostly focus on convenience and stylish design, and

is thereby not recommended.

• Data Safety

For systems that demand a higher level of data protection, storage systems

with the RAID function should be used. These types of systems have fault-

tolerant mechanis

ms so that even if the hard disk drive is damaged, data will

not be lost, and will not affect operations when the drive is replaced.

In terms of operational aspects, whenever possible, choose storage sys-

tems that are easy to operate and have clear LCD displays to reduce

user mishandling. Storage systems sold on the market for corporations use

usually come with complex function setting, which are s

uitable for pro-

fessional users. As DVR users might not have sufficient computer skills, there-

fore when using DVR with RAID, operations must be simple and easy.

• Efficacy

Recording/Playback on a DVR is a type of random access action for

the storage system. An efficient storage system can reduce the sud-

den pausing of images. The NCQ function on SATA can reorder the

disk drive’s read/write instruc

tion; thereby reducing the magnetic

head’s waiting time during its random accessing. This is especially

significant when multitasking. It can be enhanced up to 30%. There-

fore, when using a DVR with storage system, users that use SATA with

NCQ function can reduce the sudden pausing of images when simultaneously recording and

playing back.

• Expansion

DVRs with the SATA Port Multiplier function can

maintain better ex-

pansion flexibility. The eSATA expansion interface on most DVRs can

be connected to an external HDD or a RAID subsystem, but an eSATA

with SATA Port Multiplier will have even better expansion ability. Ac-

cording to specs set by standard organizations, the SATA Port Multi-

plier can be expanded up to 15 sets of hard disks or RAID subsystems;

hence, it can be expanded at any time t

o cope with the need for longer recording time.

• Compatibility

DVRs and storage systems from the original manufacturer are often the best combination. Com-

patibility is very important. The system will not be able to operate normally if there are any com-

patibility problems. Ask the original manufacturer for their recommendation before buying. After

all, the compatibility of embedded DVR products a

re not as mature as the PC industry. Avoid

mixing and using products from different manufacturers that have not been tested. Using the

DVR and storage system from the same manufacturer is often the best match. Moreover, any

technical problems can be resolved by the same manufacturer.

If you have any product matching related questions, please contact our agents or technical

consultants.

The Key Points of Choosing DVR Storage Subsystem

no NCQ NCQ

DVR Storage

System

a. Reliability

b. Data

Protection

c. Efﬁcacy d. Expansion e. Compatibility

Recommendation

For the system

to operate 24/7,

use a DVR and

professional grade

storage device

that meets eSATA

standards.

Simple and easy to

use RAID storage

system, even if the

hard disk drive is

damaged, data

will not be lost,

and will not affect

operations.

Users that use SATA

with NCQ function

can reduce the

sudden pausing

of images when

simultaneously

recording and

playing back.

DVRs with the

SATA Port Multiplier

function can

maintain better

expansion ﬂexibility.

DVRs and storage

systems from

the original

manufacturer are

often the best

combination.

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