Hard Disk
Hard Disk
How to choose a hard disk recorder
Currently on the market are many kinds of DVR products. How to choose a most suitable hard disk video recorders, for many engineering companies have is a problem, especially the novice, it is impossible to start, select the hard disk video recorders, hard disk video recorders should be inspected in the way of image compression , image quality, real-time, network performance, stability and price, compression technology is the core of the hard disk recorder, select the compression method which is most critical. Here it is necessary to take into account the quality of images, but also take into account the image storage and transmission speed. The current video card hard drive appeared on the market are mainly compression M-JPE, wavelet algorithms, MPEG-1, H263, MPEG-4, H.264 and so on.
1, M-JPEG is a JPEG-based still-image compression technology developed in the dynamic image compression technology, the drawback of low compression efficiency first, M-JPEG algorithm is based on the contents of each frame image compression, rather than the difference between adjacent frames to be compressed, thus creating a lot of redundant information is repeated storage, storage space occupied by the large per frame 8 - 20k bytes, it is best to do only 3k bytes per frame . Another point of difference is its real-time, in every way to ensure that all must be the premise of high-definition, it is difficult to complete real-time compression, and frame loss is serious, if the use of high compression ratio of the video quality will be seriously reduced. Tends to phase out such cards, but the price is cheap.
2, the wavelet algorithm technology is to make the image signal in time domain and frequency domain resolution, while the highest resolution. Kernel is used to compress and decompress in the way of the road, up to 70:1 or higher compression ratio, JPEG compression complexity of about 3 times, it is used for the MPE cited as the wavelet decomposition is very suitable for video image compression, so that image compression of wavelet theory to become the most successful areas of application. Of such cards by the MPEG-4 video card, hard drive, this might become obsolete.
3, MPEG-1 and M-JPEG technology comparison, MPEGI in real-time compression, the amount of data per frame, processing speed has improved significantly, PAL system for, MPEGI meet up to 16 more than 25 frames / sec compressed speed, the compressed stream and the clarity of the line 352 x288 pixels, each frame size is only 2k. MPEG-1, but there are also many deficiencies. First, the compression ratio is not big enough, in the case of multi-channel monitoring, recording the required disk space is too large. Second, the image resolution is not high enough, the maximum resolution is only 352x288, and the third is the bandwidth of the image transfer elm have certain requirements, in the ordinary telephone line can not be narrow-band network, remote multi-channel video transmission. Fourth MPEGI video frames fixed to 25 frames per second, video can not be dropped frames, using less flexibility. Currently on the market the card is mainly used internally MPEG1 MPEG1 hardware compression board. Such cards become obsolete. Completely replace the MPEG-4 products.
4, H.263 has a higher compression ratio, but the image quality than MPEG4.
5, MPEG-4 high compression ratio, image quality variable (VCD to DVD quality), MPEG4 compression ratio is much higher than MPEG1, M-JPEG is can not be compared. MPEG4 video and audio using fully synchronous video hard disk space required is about the same image quality MPEG1 or the space required by M-JPEG 1 / 10, so the user to select a MPEG-4 compression format with hard disk video recorders, using MPEG -4 compressed hard disk video card has two types of software compression and hardware compression board. MPEG-4 hardware compression cards on the market a lot. But MPEG-4 hardware compression software basically secondary development. DVR image quality is also a very important performance indicators, not just image quality and compression of the way, but also with graphics, image processing technology, software technology has relations, technical handled properly, moving picture often there tail, serrated and low-resolution series of drawbacks. Because of these shortcomings is very intuitive, easy user selection and engineering business.
6, in the MPEG-4 hardware compression based on a number of improvements, more conducive to the transmission network, but also it is set way video stream. Is a very cost-effective products.
Real-time is a lot of users are very focused performance, especially in banks, cash registers and other controls, real-time requirements are higher, but the real-time and hard disk consumption, computer configuration, the board is directly proportional to cost, while full-time video monitoring of network traffic caused a lot of pressure. So, in ordinary places as far as possible when monitoring use of non-real-time monitoring video. If images per second, 6.5 to 12.5 to meet the security, hall, factory management, residential quarters, hotels, shopping malls, elevators and other places most of the monitoring, and better network transmission, consumption of small hard disk, hard disk storage for longer. In today's highly developed network, the network DVR remote monitoring has become necessary functions, due to bandwidth limitations, compression ratio, effect of network transmission of MPEG-4 products better most users. Windows Media Player.Mainly by network monitoring client software, Windows Media Player, IE, etc. monitoring. Stability is a hard disk video recorders and other hardware and software products is very important indicator. Stability of a number of factors, the stability of the hard disk video recorders with the following factors: 1: motherboard, video card, video card and hard disk, hard disk, etc. 2: Operating System 3: hard disk video software.
Therefore, the stability of the pursuit of hard disk video should try to choose good reliable motherboard, such as MSI, Asus, Gigabyte etc, hard disk video recorders in the image processing capacity, so do not be cheap too, the use of poor quality, or many years ago technological backwardness of the old graphics card. Operating system is also an important factor affecting stability, install the hard disk video recorders are not recommended as far as possible WINDOWS2000 WINDOWS98, hard disk video software market, many are using MFC, VB, dephi written in other development tools, the use of these tools to prepare the hard disk recording as software and quick, but poor quality software, users may wish to check the hard disk video software executable file (EXE file) in size, if large, larger than 5M or more, is probably using MFC, VB, dephi such as the development from . Hard disk video software executable file (EXE file) the size of the smaller, indicating the software to do even better, good stability.
About the Author
Epathchina's main products include all kinds of Spy Cameras , Surveillance Equipment , China Security Equipment, access control system, CCTV Surveillance System and etc. We keep updating and enriching our product lists, which aims to provide a wide range of choices for our consumers.
|
|
640GB Laptop HDD HP G60 CQ60 CQ62 CQ50 Dell 1525 1545 DV5 DV6 DV7 dv9000 MA3 G62 $89.99 |
|
|
HP COMPAQ NC8000 Hard Drive Cover Door HDD Cover Door "A-Grade" Fully Tested $9.95 |
|
|
30GB Apple 655-0903 Maxtor 33073H3 YAH815Y0 3.5" IDE HARD DRIVE HDD $29.78 |
|
|
15GB Maxtor DiamondMax VL 30 31536H2 BAC51KJ0 3.5" IDE HARD DRIVE HDD $28.21 |
|
|
30GB Maxtor DiamondMax VL 40 33073H3 YAH814Y0 3.5" IDE HARD DRIVE HDD $31.35 |
|
|
IBM NETVISTA THINKCENTRE HARD DRIVE CD TRAY 48P6547 $7.76 |
|
|
HP TC1100 Tablet PC 20Gig Hard drive w/ re-coup-dsks $95.00 |
|
|
Fujitsu P1120 P 1120 Hard Drive Plug Play ready to go $89.00 |
|
|
Dell PowerEdge 2300 SCSI Hard Drive HD Backplane $10.00 |
|
|
IBM Lenovo Ideapad S10 Hard Drive Cover Door 39FL1HD00V0 45N5895 $19.95 |
|
|
Toshiba Mini NB305 Hard Drive Cover Door am0bh000400 $8.99 |
|
|
Antec Easy SATA Hard Drive Enclosure $20.31 |
|
|
Samsung RF710-S02US harddisk back cover $39.99 |
|
|
20pc Hard Drive Screws - Coarse Thread NEW $1.75 |
|
|
Apple XServe 2* 3.0GHz Intel Quad Core Xeon 8 CORE (year 2008) 4 GB RAM /NO HDD $10,900.00 |
|
|
Apple XServe 2* 3.0GHz Intel Quad Core Xeon 8 CORE (year 2008) 4 GB RAM /NO HDD $750.00 |
|
|
Apple XServe 2* 3.0GHz Intel Quad Core Xeon 8 CORE (year 2008)16GB RAM/3-1TB HDD $1,695.00 |
|
|
Apple XServe 2* 3.0GHz Intel Quad Core Xeon 8 CORE (year 2008) 4 GB RAM /NO HDD $17,750.00 |
|
|
Apple XServe 2* 2.66 GHz Intel Dual Core Xeon 4 Core (2006)8 GB RAM /73 GB HDD $425.00 |
|
|
Apple XServe 2* 3.0GHz Intel Quad Core Xeon 8 CORE (year 2008) 4 GB RAM /NO HDD $760.00 |
|
|
Apple XServe 2* 3.0 GHz Intel QUAD Core Xeon / 8 GB RAM / No HDD/LOT OF 5(2008) $3,700.00 |
|
|
Apple XServe 2* 3.0GHz Intel Quad Core Xeon 8 CORE (year 2008) 4 GB RAM /NO HDD $35,750.00 |
|
|
Apple XServe 2* 3.0GHz Intel Dual Core Xeon 4 Core (2006) 16 GB RAM / 80GB HDD $689.00 |
|
|
Apple XServe 2* 3.0GHz Intel Quad Core Xeon 8 CORE (year 2008) 4 GB RAM /NO HDD $751.00 |
|
|
Apple XServe 2* 3.0 GHz Intel DUAL Core Xeon / 8 GB RAM /NO HDD/LOT OF 10 $4,450.00 |
|
|
Apple XServe 2* 3.0GHz Intel Quad Core Xeon 8 CORE (year 2008) 4 GB RAM /NO HDD $900.00 |
|
|
Apple XServe 2* 3.0GHz Intel Quad Core Xeon 8 CORE (year 2008) 8 GB RAM /NO HDD $775.00 |
|
|
Apple XServe 2* 3.0GHz Intel Quad Core Xeon 8 CORE (year 2008)16 GB RAM /NO HDD $800.00 |
|
|
Apple XServe 2* 3.0 GHz Intel Dual Core Xeon 4core(2006)16GB RAM 80GB HDD $589.00 |
|
|
Apple XServe 2* 3.0 GHz Intel Xeon Dual Core(2006)4 Core/ 32 GB RAM / 80GB HDD $810.00 |
|
|
Apple XServe 2* 3.0 GHz Intel Dual Core Xeon(2006) 4 Core 16 GB RAM /73GB HDD $611.00 |
|
|
Apple XServe 2* 3.0GHz Intel Quad Core Xeon 8 CORE(year 2008) 8 GB RAM/1TB HDD $1,495.00 |
|
|
HP Compaq nc6400 Series Hard Disk Drive Cover HDD Door $8.99 |
|
|
Acer Aspire 5610 Hard Drive Cover Door AP008001800 $7.28 |
|
|
Laptop 2.5 HD to 3.5 IDE Hard Drive HDD Adapter Card $4.40 |
|
|
500GB Hard Drive for Dell Inspiron 530 530s 531 531s Precision WorkStation 690/N $36.00 |
|
|
HP Pavilion 520N HARD DRIVE BRACKET HOLDER 126621-0000605 $3.99 |
|
|
Acer Aspire 5336 Original Hard Drive Caddy $8.99 |
|
|
IBM LENOVO 3000 V200 HARD DRIVE HDD COVER DOOR 60.4S811.003 $9.99 |
|
|
Toshiba Protege R500 Hard Drive Cable FMUSH1 A5A002120 $14.62 |
|
|
60GB Maxtor D740X-6L MX6L060J3 3.5" IDE HARD DRIVE HDD $36.05 |
|
|
SIIG JU-SA0H11-S1 HARD DRIVE ENCLOSURE 2.5IN IDE/SATA TO USB 3.0 6GB/S $29.84 |
|
|
HiGrade VA250D Hard Drive Cover $7.06 |
|
|
500GB 5400RPM 2.5" SATA MacBook Pro Hard Drive 984 $98.95 |
|
|
Aluminum G4 Hard Drive Flex Cable - 922-5998, 922-6685 - Used $6.95 |
|
|
Compaq Presario F700 Hard Drive Cover Door $3.95 |
|
|
HP 212398-001,400 watt redundant power supply for storage works hard drive array $20.00 |
|
|
Acer Aspire 1810T Hard Drive Cover Door 3AZH7HDTN00 $29.95 |
|
|
iPod Mini Hard Drive Cable $6.95 |
|
|
Compaq Presario 1200 Genuine Hard Drive Caddy w/ Screws $9.99 |
|
|
Acer Aspire 1200 1203XV Hard Drive Caddy w/Screws AP30N327000 $19.99 |
|
|
Sony Vaio VGN-TX770P VGN-TX Hard Drive Caddy $9.99 |
|
|
Apple Powerbook G3 M7572 Hard Drive Connector 632-0116-A $11.95 |
|
|
HP Omnibook 4150 Hard Drive Connector Cable LS30T LF351 $11.95 |
|
|
Dell XPS 700 710 720 Hard Drive Cooling Fan UJ023 HD445 $6.68 |
|
|
TOSHIBA TECRA M5-S5331 HARD DRIVE CONNECTOR BOARD SATA $24.99 |
|
|
HDD Caddy / Cage / Bracket / Holder for PC (2xHDD) $15.05 |
|
|
Genuine HP Probook 4520S 4530S Hard drive caddy 598697 $17.95 |
|
|
389343-001-New Bulk HP 72GB 15K SAS 3.5 DP HDD $79.00 |
|
|
AW613SB-New CTO HP StorageWorks D2600 w/6 450GB 15k HDD $5,500.00 |
|
|
AW523A-New CTO HP StorageWorks D2600 w/12 600GB 15K HDD 7.2TB Bun $9,500.00 |
|
|
BV919A-New CTO HP P2000 G3 iSCSI DC w/12 300GB SAS 10K SFF HDD 3. $11,500.00 |
|
|
BV920A-New CTO HP P2000 G3 iSCSI DC w/12 600GB SAS 10K SFF HDD 7. $15,000.00 |
|
|
BV902A-New CTO HP P2000 G3 FC DC w/24 300GB SAS 10K SFF HDD 7.2TB $16,000.00 |
|
|
BV914A-New CTO HP P2000 G3 FC DC w/12 600GB SAS 10K SFF HDD 7.2TB $15,000.00 |
|
|
BV905A-New CTO HP P2000 G3 FC/iSCSI DC w/24 300GB SAS 10K SFF HDD $17,500.00 |
|
|
DELL INSPIRON 300M HARD DRIVE HDD CONNECTOR BA41-00368A $9.65 |
|
|
StarTech eSATA USB to SATA External HDD Dock $26.21 |
|
|
Panasonic Toughbook CF-19 Hard Drive Caddy $99.00 |
|
|
LOT OF 5 LAPTOP HARD DRIVE CONNECTOR IBM DELL COMPAQ $0.99 |
|
|
Toshiba Tecra 8100 8200 9000 Hard Drive Caddy + Screws $5.99 |
|
|
HP Hard Disk Drive 146.8 GB 15000 RPM 3.5" MAU3147NC BF14688577 365699-003 $39.94 |
|
|
Dell Dimension 3000 IDE 160GB Hard Drive loaded with OS $45.95 |
|
|
HP DM4 RAM HDD Hard Drive Wifi Door Cover 6070B0441601 $39.99 |
|
|
PC ATX SATA PSU HDD Power Supply Diagnostic Tool Tester $5.69 |
|
|
Gateway 4535 Hard Drive Cover Door AAFJ51100016F0 $6.80 |
|
|
MacBook 13" UniBody hard drive bracket w/IR and sleep light $19.99 |
|
|
Nu 4in1 PC Motherboard CPU RAM DDR3 VGA HDD Analyzer Diagnostic Stability Tester $15.50 |
|
|
Dell Vostro 1720 HDD Door Covering Y168C $18.00 |
|
|
Philips MT2100 HDD Hard Drive Caddy Bracket 1009117 $15.60 |
|
|
HP PAVILION DV7 DV7-1000 SERIES HARD DRIVE MEMORY WIRELESS COVER AP03W000H00 $3.99 |
|
|
Sony Vaio PCV-RX624 RX201 HDD Hard Drive Caddy Tray Bracket $15.60 |
|
|
MAXTOR Fireball 3 ATA/133 40GB HARD DRIVE MDL: MA2F040LO $8.00 |
|
|
IBM THINKCENTRE HARD DRIVE CADDY 2000A515 $4.99 |
|
|
IBM 40GB 5400 RPM IDE HARD DRIVE 07N3926 $24.99 |
|
|
QUANTUM IDE HARD DRIVE L20A011 DEL PN 00009PVR 20GB $26.99 |
|
|
HP PAVILION G60 COMPAQ PRESARIO CQ60 HARD DRIVE CADDY 498477-001 $3.00 |
|
|
MAXTOR 10GB IDE HARD DRIVE 2B010H1 WAH21PB0 $30.15 |
|
|
IBM Lenovo IdeaPad S10 Mech HDD door Hard Drive Cover panel hatch 45N3777 "B" $23.10 |
|
|
Dell Inspiron 2650 Hard Drive Caddy $2.99 |
|
|
Toshiba Satellite 5105-S901 Hard Drive Caddy $1.89 |
|
|
MAXTOR 2GB IDE HARD DRIVE 82100A4 $39.94 |
|
|
Toshiba Satelite a205 Hard Drive Cover V000927170 $4.99 |
|
|
Presario Compaq motherboard V2000 No Memory, Hard Drive, Battery, or Disk Drive $50.00 |
|
|
ACER ASPIRE 5570Z HARD DRIVE COVER EBZR1008013 $9.99 |
|
|
Toshiba Satellite X205 Second Hard Drive Cover Door AP017000X00 $5.49 |
|
|
DELL OPTIPLEX HARD DRIVE BRACKET COVER 2R033 7P863 $17.99 |
|
|
Toshiba Satellite X205 Hard Drive Cover Door AP017000V00 $6.89 |
|
|
Genuine HP Mini 110 110-3830NR Hard Drive caddy with connector Cable FBNM1010010 $12.49 |
|
|
5 Dell GK158 Optiplex GX520/620 hard drive caddies $27.99 |
|
|
StarTech.com Hard Disk Drive Duplicator Dock $69.49 StarTech.com Hard Disk Drive Duplicator Dock |
|
|
LaCie Hard Disk MAX 301874U DAS Hard Drive Array - 4 TB Installed HDD $279.99 255 characters or less! |
|
|
JVC GZ-HD520 HD Everio Camcorder (Refurbished) $332.99 The JVC GZ-HD520 HD Everio Camcorder is a mid-range high def camera that boasts 1920 x 1080 recording, a 120GB hard disk drive, and a microSD card slot. At your disposal with the HD520 would be 40x optical zoom and JVC's Advanced Image Stabilizer. |
|
|
SYBA USB 3.0 Hard Disk Drive Docking Station for SATA 2.5-inch HD $43.49 This is a SYBA black USB 3.0 hard disk drive docking station for SATA 2.5-inch or 3.5-inch HD. Protect your hard drive against shakes and vibrations. |
|
|
Hitachi DZ-BD7HA Blu-Ray 5.3MP 30GB DVD Hybrid Camcorder (Refurbished) $295.99 The flagship DZ-BD7HA camcorder is a Hybrid model. This means it provides the Blu-ray disc recording capability along with a 30 gigabyte built-in hard disk drive (HDD) which can record approximately four hours of 1920 x 1080 high definition video. |
|
|
USB 2.0 to IDE/ SATA Converter Cable $8.99 This USB 2.0 to IDE, SATA converter cable allows you to use your 2.5-inch or 3.5-inch IDE hard drive or SATA hard disk as an additional external hard drive. The SATA, IDE device connects to your computer through a USB port. |
|
|
3.5-inch Black IDE Aluminum HDD Enclosure $14.99 This 3.5 inch IDE HDD Enclosure features a high-speed external storage system for your 3.5 inch hard disk drive. |
|
|
SATA to IDE/ IDE to SATA 2-in-1 Converter Cable $6.49 This is a SATA to IDE/ IDE to SATA 2-in-1 Converter Cable. Convert IDE (Standard Parallel IDE) to SATA interface and enable SATA hard disk to be installed with this converter cable. |
|
|
Adaptec 39160 1822300 160 MBps SCSI PCI Storage Controller $27.99 The Adaptec SCSI Card 39160 supports up to 30 devices, making it ideal for connecting external drive arrays for mirroring and striping multiple SCSI hard disk drives to deliver the ultimate performance in the most demanding environments. |
|
|
USB 2.0 to IDE/ SATA Converter Cable $10.49 This USB 2.0 to IDE, SATA converter cable uses your 2.5-inch or 3.5-inch IDE hard drive or SATA hard disk as an additional external hard drive. The SATA, IDE device connects to your computer through a USB port. |
Thanks for visiting!