<img class="galleryImageBorder wsite-image alignright" src="http://aplus-sample-question-exam-papers ou acheter viagra sans ordonnance.weebly.com/uploads/1/2/6/2/12624177/7096812.jpg?251″ alt=”Picture” />Computer processors (also called CPU) are the most important part in the computer at all. It controls the overall remaining components of the computer such as the mouse, keyboard, monitors, and others. The processor is an electronic circuit that executes computer programs. It does in four basic phases:
1. Fetch: in this phase, the processor collects the bytes to execute from memory (which may be RAM or cache). Each instruction is saved in memory as one or more bytes called word. The more the word length, the more complexity and power consumption of the processor. Once the processor collects the bytes, then it is ready to decode it.
2. Decoding: In this phase, the processor takes the bytes read in the previous step and input them to the decoder. The decoder activates then the line corresponding to the instruction whose bytes equal to the bytes read from the fetching phase. Each instruction in the processor is mapped to a certain bits or bytes by the designer so that when the processor fetches these bits or bytes, it can understand them. The number of bits used to represent each instruction may vary according to the processor type. Note that this number of bits may not take the whole word in the memory. For example if the word is represented by 8 bits, then the first four bits can be assigned to the instruction part and the last four bits can be assigned to the data which is needed for the instruction to execute.
3. Executing: once the processor knows the meaning of the bits by the decoder, it goes then to the execute phase. In this phase, the processor makes the necessary operation as denoted by the decoder. This operation is done on the operand contained along with the instruction bits in the memory word.. The operation can be addition, subtraction, AND, or any mathematical or logical operation.
4. Write Back: once the processor done the operation, it writes it back to the memory in the place denoted by the instruction. This result may be fed to other instructions in the same program.
This processes repeated for each instruction until the whole program is executed
Server contains crucial business data; therefore, it is quite pertinent that companies protect it a lot using various types of server racks or server cabinets. From even ordinary management point of view, it is important to protect server from outside elements and place it in secluded place in the premises. On other hand, from disaster recovery standpoint, it is quite crucial to protect the server from fire, flood and various other natural disasters; this can be done only when fireproof and waterproof server racks or server cabinets are used.
Generally, server racks are designed to hold items and contain two-post or four-post frames, depending upon specific requirement. Thus, a frame used to put server components; server racks have seen tremendous changes over the years. Today, most of the server racks are designed to hold the servers and also to cool them down by allowing air to flow in. Flow in of air is from front-to-back direction helps server cool down. Depending upon server’s size, the availability of space, etc. server racks come in various shapes and sizes and in various price tags.
Protection should also be provided to computers using computer cabinets that are made using waterproof and fireproof materials for it contains vital business data, proprietary research and critical digital data that is crucial for any organization. Though fireproof hard drive or network attached storage server can be considered strategically well established options, only waterproof and fireproof computer cabinets can save it from any disaster.
If there is no need for a full server rack or cabinet, it is lot better to have a wall mount rack or wall mount cabinet which can be either enclosed or open. These are considered ideal when there is lack of space e.g. wall mount rack conserves space and helps save money. Moreover, as these come in varied sizes, heights, depths and models, customers have plenty of choices to select from. These in fact, can be put anywhere e.g. server room, tight closet, over-the-desk, classroom environment, supervisor area or warehouse, etc.
Protecting computer systems and associated components e.g. telecommunications and storage systems, a data center plays crucial role in modern day corporate functioning; therefore, steps should be made towards buying durable and higher quality data centre that gives protection to redundant or backup power supplies, redundant data communications connections, environmental controls such as AC, fire suppression, etc. Similarly, racks cabinets offer a variety of power options to accommodate high density deployments of servers, blades and storage systems.
There are different forms of computer memories available in field of computer hardware market and every memory has its own specific role to play recherche viagra. We will discuss flash memory and system memory also known as RAM. RAM is commonly found in all computer types, whether it’s a desktop, laptop, tablet or mobile. If you are upgrading your memory, it is very important that you know the essential difference between flash memory and RAM.
Flash memory is special type of memory which can be programmed and re-programmed and it can also be electronically erased. Flash memory non-volatile computer memory and it is the best user friendly type of memory which makes effective use in the game consoles and memory cards. Flash memories are used in USB flash drives which easily fix to the USB ports and users can save the data easily in them. The area where extensive use of flash memories is seen includes laptops, PDAs, digital cameras, audio players, and phones. Since flash memory is a non volatile memory, all the data stored is not lost unless you do not erase or stored in the RAM memory. Flash memory comes in two forms namely NOR and NAND. NOR can easily access any type of memory location using the data busses and full addresses.
However, NAND has faster writing and erase timings but doesn’t have random access. NAND flash memory is used for memory cards, but is not meant to be used as replacements for ROM chips. However, there are limitations to flash memories and the most significant being that flash can only be erased and rewritten only for finite number of times. But even though flash memory can be erased and rewritten for finite number of times, it is considered to be the most popular memory which can add difference to your computer and laptop and make it work efficiently.
System memory or RAM is commonly used in desktop, server and mobile devices. RAM comes in many module types, one of the variants is called DDR memory also known as Double Data Rate and has evolved from the much slower SDRAM. DDR memory can easily transfer data up to 3200MB/s and consumes less of power than the traditional SD RAM memories. There are different types of variants of DDRs available in the RAM market. DDR1, DDR2 and DDR3 are the common types and you have to make sure that DDR memory you select is compatible with your computer system.