thickness: but laptop hard drives have a desktop hard drive has no parameters, is the thickness, standard laptop hard drive 9.5,12.5,17.5mm of three thickness. 9.5mm hard drive is designed for ultra light thin models, 12.5mm hard drive is used primarily for light soft exchange of considerable thickness and total built-in models, 17.5mm hard drive is a product of previous single-disc capacity is low, have basically no models used.
speed: portable hard drive because uses a 2.5-inch disc, even if the speed is the same as the linear velocity of the outer ring cannot be compared with 3.5-inch desktop hard drive platters, portable hard drive is now portable performance improves the biggest bottleneck. Now mainstream speeds of 7200rPm desktop hard drive, portable hard drive speed is still mainly to 5,400 rpm.
interface type: notebook hard drives generally use 3 form and connected to the Board: hard drive pin and socket connection on the motherboard directly, with a special hard drive connected to the line and Board, or transfer interface and socket connection on the motherboard. Regardless of the method to be adopted, the effect is the same, but depends on the manufacturer's design.
capacity and use of technology: because applications are large, hard drive capacity is a rising trend, for portable hard drive, not only its large capacity, but also small in volume. To resolve this contradiction, laptop hard drives generally use their reluctance of magnetic heads (MR) technology or expand Magnetoresistive heads (MRX) technology, at very high density recording of MR head data, thus increasing the disk capacity, increase data throughput hp pavilion dv4 battery, while reducing the number of heads and disk space, improve disk reliability and resistance to interference and vibration performance. It has also been used such as enhanced Adaptive battery life extender, PRML digital channel, new smooth head load/unload and high-tech.
memory notebook computer memory can make up to a certain degree of performance degradation due to slower processor speed. Some notebook computers will be placed on the CPU, or very close to the CPU cache memory places, so that the CPU can access data faster. Some laptops also have a greater degree of bus in order to faster transfer of data between the processor, motherboard and memory.
as the laptop integrated high, designing precision, demand for memory is relatively high, must conform to the characteristics of compact notebook memory, use high quality components and advanced technology, with small volume, large capacity, high speed, low power consumption, heat dissipation features such as well. For the pursuit of compact considering most laptops only up to two memory slots.
laptop memory modules typically use smaller to save space. Notebook computer in the using of memory type including:
�� Compact shape double column direct plug memory module (SODIMM)
�� double data transfer rate synchronization dynamic random access memory (DDR SDRAM)
�� single data transfer rate synchronization random access memory (SDRAM)
�� proprietary technology of memory module
some notebook computer of memory to upgrade, and can by can demolition Panel to easily disassembly and Assembly memory module.
development of portable memory is divided into
and other accessories like memory development are desktop-based. Initial memory is soldiered to the motherboard. Memory stick is generally starts from the 286 memory chips on the motherboard, 30pin, 256K, and is made up of 4 a Bank side shows. 30pin, 16MB at the time of rare, expensive. Many of the later books of memory. November
1982 year, Compaq introduced the first IBM-compatible portable computers, using 128KB of memory RAM. Notebook memory is really began in 486 era. Notebook available memory at that time almost strange, a brand, a model of a suitable memory, because the machine itself this time with trial and error and the nature of the test, some machines are more directly with PCMICA memory cards to memory.
to the 586 stage, Taiwan manufacturer of notebook product step by step uses 72pin standard SO DIMM notebook memory, in fact, there are at least 4 72pin SO DIMM memory: 72pin FPM SO DIMM, 72pin 5V EDO 72pin FPM SO DIMM and the 72pin EDO SO DIMM. Like most of the memory and video cards are welded on the motherboard.
to the Pentium MMX stage occurred 144pin EDO standard SO DIMM notebook memory, that is, said EDO memory. Use this memory needs to double, prices are still very expensive.
transition Messenger-SDRAM
experience the Pentium era, has become increasingly fast CPU, Intel company proposed a landmark memory technology----SDRAM. , At this point, entered the era of full standard memory notebook memory.
standard notebooks on the market of SDRAM is 144pin SO-DIMM interface, and most of the PII and PIII laptop use is SDRAM memory. SDRAM memory manufacturer and brand a lot, but relatively speaking are not very expensive, product performance difference is not more famous brand Kingmax,kinghorse, original, and so on.
a qualitative leap-DDR
DDR SDRAM as the name suggests, Double Data Rate (double the data transfer) SDRAM. With the introduction of desktop DDR memory, laptops have long been into the DDR era, in fact, principle of DDR is not complicated, it makes one pulse SDRAM read once information can be read in less than a pulse twice the information, or rising edge and falling edge of the pulse on the channels are used, therefore is SDRAM DDR nature. And more power relative to EDO and SDRAM,DDR memory (operating voltage for 2.25V only), single volume a greater (can 1GB).
batteries laptops and desktops will need current to work. They are equipped with a small battery to maintain real time clock (in some cases there are CMOS RAM) running. However, different from the desktop, the portability of a laptop is very good, on battery alone can work.
nickel cadmium (NiCad) battery is the first type of battery types commonly zxcsky32645 found in laptops, older laptops may still be using them. They charged last time after about two hours or so, then you need to charge it again. However, due to memory effect, the continued use of the battery time will gradually decrease as the number of charge increase. Panels will produce bubble, thereby reducing the amount of battery space can be charged again. The only way to solve this problem is: the battery before charging again, to completely discharge the battery. Another drawback of the nickel-cadmium battery, if the battery charging time too long, it may explode.
nickel-metal hydride (NiMH) batteries are nickel-cadmium batteries and subsequent transitional product between lithium-ion battery. They charged to last longer Hp Pavilion Dv6700 Battery, but overall life expectancy is shorter. They are in place and memory effect, but affected levels lighter than nickel-cadmium batteries.
lithium battery is the current standard battery of notebook computers. They are not only the weight is light, and long life. Lithium battery memory effect does not exist, you can charge at any time, and in the case of excessive charging is not overheating. In addition, they are thinner than other batteries are used on the portable computer, it is ideal for ultra thin notebook. Between the lithium-ion battery charging times in 950-1200.
many claims that a notebook equipped with lithium-ion battery for 5 hours of battery life, but this time with the computer using a close relationship with the way. Hard disk drive, to a different disk drive and LCD monitor consumes a lot of battery power. Even browsing the Internet via a wireless connection also consumes some battery power. Many notebook model power management software is installed, to prolong battery life or save power when battery low.
sound most notebook computers with a sound card or integrated sound chip on the motherboard, and equipped with a small built-in speakers. However, the laptop's small interior space is usually sufficient to hold top-quality audio or high quality speakers. Game enthusiasts and music fans can use external audio controller (using a USB or FireWire ports to your notebook computer) to make up for lack of laptops on the sound quality.
graphics video cards are divided into two broad categories: integrated and discrete graphics, performance discrete graphics better than integrated graphics.
integrated video is will display chip, and memory and related circuit are do in Board Shang, and Board thaw for one; integrated video of display chip has separate of, but now most are integrated in Board of North Bridge chip in the; some Board integrated of video also in Board Shang separate installed has memory, but its capacity smaller, integrated video of display effect and processing performance relative weaker, cannot on video for hardware upgrade, but can by CMOS regulation frequency or brush into new BIOS file implementation software upgrade to mining display chip of potential; integrated video of advantages is power low, and heat small, and part integrated video of performance has can comparable started level of independent video, so without spent additional of funds purchase video.
discrete graphics refers to display graphics and related circuits on a chip, a separate to do on a circuit board, self-contained and as a standalone Board exists, it uses the motherboard expansion slots (ISA, and PCI, and PCI-e or AGP. Discrete graphics video memory are installed separately, generally do not use system memory, in the technology is also much more advanced integrated graphics than integrated graphics can be better display and performance, graphics hardware upgrades easy; the disadvantage is that the system power consumption has increased, heat is also a larger, additional funds spent purchasing the video card. Discrete graphics into individual boards exist, need to be plugged in to the Board on the appropriate interfaces, discrete graphics with a separate graphics memory, do not consume system memory and technology leader in integrated video, to provide better operating performance of the display and
separate video cards are divided into two broad categories: NviDIA often say "n" card and ATI usually says "a" cards.
typically "n" card main tendencies in the games, "a" cards main tendencies in film and television images. However, on the testing of non-professional level, this tendency is smaller. Now, with Visual effects into DX10.1 era, along with the video card upgrades also accordingly. Two major graphics vendors Nvidia and ATI have also launched a new video card, Nvidia and ATI 100M series 4,000 series, they are all valid support DX10.1 effect processing.
N card: Nvidia 100M series market Shang main has Nvidia G102M, and Nvidia G103M, and Nvidia G105M, and Nvidia G110M, and Nvidia G120M, and Nvidia G130M these, label more high of products performance more good, they by corresponds of 9 generation video respectively is 9200GS, and 9300GS, and 9400GS, and 9500GS, and 9500GT, and 9650GT, this Foundation Shang performance are has larger site upgrade (description, popular of told "GS" "GT" representative performance (performance marked), GTX>GT>GE>GS>GSO). 9 generations of card or there is a large part of the manufacturers, mainly from 9200-9650.
A cards: ATI, 4,330 main 4,000 series on the market, 4 Dell Inspiron 9400 battery,570, which is also higher performance label, the better. Also most of the products with 3,000 series of old video card, 3,450, 3,470, and so forth. A third digits of the card model is equivalent to n card GS, GT.
graphics performance to identify major: model> performance marked> video memory size> memory frequency.
built-in transformer General notebook computers because of portability, so have a built-in transformer in particular rated voltage of electrical appliances at home and abroad are not the same when abroad. therefore, in order to meet that laptops are generally has a built-in transformer. scope and lifetime of notebook computers have greatly increased. Hard drive performance of the hard disk have a significant impact on overall system performance. size: portable hard drive is generally used by 2.5 inches Ibm Thinkpad T400 Battery, and Desktop 3.5 inch laptop hard drive is a portable one pass
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