26 Şubat 2008 Salı

The History of Computer

Uninformed researchers of computer (computador) history would probably note the first computer in the mid 1930`s. In reality, this history dates nearly 2000 years ago with the invention of the abacus where the user programmed beads using formulated constructs.

Although many historians caution against the use of the word computer (computador) except to define 20th century computers, a broader understanding illuminates an instrument designed by a Frenchman and which functioned as a calculator and was designed for a tax collector in the 1600`s. Improvements to this calculator continued through the 19th century.

Similar work was underway in England and with the support of the government a `mechanical` calculator was invented. It was powered by steam and supported a fixed program for its use. This calculator went through many changes until an automatic calculator was invented. Following this flurry of discovery and invention, little changed until the early 1900`s when detailed mechanical and transportation work required complex mathematical calculations (especially calculus).

Two Census Bureau workers began to look for a means of accurately calculating information. They conceived the idea of a punch card which would be inserted into the computer (computador), read, and stored. The greatest advantage of these still slow moving machines was the ability to store large amounts of information with ease and accuracy.

The early 1940`s and the imminent World War, brought the military into the computer era (computador). New weapons requiring computer technology for effectiveness, were needed, designed and produced. These were large floor model machines and utilized the floor space of an average one family home (about 2,000 square feet). One independent computer (computador) was not adequate and a means was found to link computers which produced a more accurate and clear channel of information. These devices were not only cumbersome but they required rewiring and rechanneling for each program. Greater inventions were in progress. These new computers (computador) would be equipped with memory capacity and worker faster than any in existence at the time.

In 1947, the first modern programmable computers (computador) were designed. They contained RAM (Random Access Memory) and made it possible to access information in seconds. This technology continued to be tested and improved into the 1950`s when magnetic core memory and a transistor circuit element were discovered. These increased the memory capacity and functionality of the computers (computador). On the down side the cost to operate these machines was astronomical. By nearly sheer determination alone, these devices evolved into amazing machines able to work with a number of programs simultaneously while giving the impression that only one program was in use.

As recently as the 1960`s computers (computador) were more available and the price had become nearly reasonable for businesses. Their use however, was confined mostly to mathematically based operations such as billing, accounting, and payroll. One of the major purchasers of these devices was hospitals which stored date from patients, inventory, billing, treatments, and the like.

By the 1980`s smaller individual computers (computador) were being produced. Technology continued to astound the general public as the microchip came into existence permitting personal computers to be sold with accompanying program disks for downloading. A glance around most medium to large companies would reveal many desk top computers in use.

It would be impossible to track the history of computers (computador) without acknowledging Apple Computer and IBM for their leading edge and evolving technology. Radio Shack coupled with Apple Computer (computador) produced video games for the computer (a move from the arcade).

The ability for businesses and individuals to access the worldwide web gave birth to new and innovative marketing and communication with inquirers and/or clients. Today it is inconceivable that one attempt to research something on line and not find multiple references there. The momentum has only continued to mount and new upgrades are available nearly by the day.

This article is under GNU FDL license and can be distributed without any previous authorization from the author. However the author's name and all the URLs (links) mentioned in the article and biography must be kept.

Identifying How Much Memory You Need on Your New Computer

If you've already been shopping for a new computer, you've probably noticed the great difference in prices among the latest models. Often, this price difference is directly proportional to the amount of memory the computer has. This makes sense too. The more memory you have on a computer, the more you will be able to do with the programs and other processes. But what you may also have noticed is a great range of possibilities in terms of memory storage. This can lead to the great computer question of the day - just how much memory is enough for you?

What are You Using Your Computer For Now?

Memory on a computer can be compared to the space that you have in your home. If you have more space, you can put more things in your home. The same can be said for your computer's memory. The more memory you have, the more programs you can run and store on your hard drive. But if you don't have to use a lot of programs on your computer, you probably don't need to have a lot of memory.

Right now, write down all of the things you use your computer for right now: email, word processing, etc. This will give you a sense of the memory you actually need from the computer you choose. Be realistic about the uses for your current computer so that this assessment can be accurate for your computer shopping comparison.

What Do You Plan to Use it For Later?

Of course, you might also be getting a new computer because you have big plans for that hard drive. In that case, try to figure out just what programs and processes you will wan to run in the future. Think big for this question because you are gathering the information you need to determine exactly how much memory you will need for your computer.

Again, make a list of the programs you will want to use on your new computer, in addition to any programs that you might buy separately, like games and office productivity software. If you can, try to make a list of these programs along with their requirements for memory usage on your hard drive. These numbers will be found on the back of the software packaging.

How Much Memory does Your Current Computer Have?

A good standard of measurement for the amount of memory you need on your computer is your current computer. Think for a minute about how well your computer is running right now. If you don't have any troubles running the programs you need, you might already have found the right computer memory measurement for your new computer.

However, what you might also want to realize is that this number from your current computer includes old software programs that you might have to upgrade on your new computer. For example, the overall platform of many new computers is a new operating system, which takes up far more space than older versions of the same software. This is simply something to keep in mind as you are calculating your future needs.

How Much Memory Do You Need?

If you have to have a number for the memory you need on your new computer, there are several ways to calculate this. The good news is that many computer retailers will have lists or quizzes that will guide you to the proper number for your needs. But in the absence of that, here are some simple guidelines:

1GB is standard for basic operating systems dating before 2007 and for using basic programs like email and word processing.
2GB is recommended for newer operating systems as well as for running MP3 programs and photo storage.
2GB+ is recommended if you are running graphical programs or multiple operating systems

These are fairly accurate recommendations, though you might want to consider one other possible way to make sure you have what you need.

Keeping Your Options Open

If you don't want to spend a lot of money on memory right now, there are ways that you can add more memory in the future. Simply ask the computer dealer how many open memory slots there are in the computer you want to buy. If you have room to upgrade your computer by 1GB, that's usually plenty of extra room for the home user.

You can also check this by looking at the memory storage for the sold model as well as right clicking the My Computer icon to see the system information. If you see a number that is higher than your memory storage, that means you can increase the memory to that number.

Memory is the key to running programs without any problems, but it's not the only thing to look at when you are shopping around. However, it is certainly going to make things easier for you in the long run.

Increasing Notebook Battery Power

Depending upon the model, a notebook battery usually lasts from 1 to 8 hours. However, with efficient battery usage, an hour or two of battery power can significantly be increased. You can save battery power by using the built-in battery saving modes and by following good notebook battery-saving practices.

Built-in battery-saving modes are Stand By and Hibernate. In the Stand By mode, open applications are stored in the RAM, the hard disks power down, the monitor switches off, but the processor goes on running. When you again perform some activity of the mouse or the keyboard, then the hard disk powers up, the monitor switches on, and the data from the RAM is activated, restoring your notebook exactly the way you left it.

The Hibernation mode is used when the notebook is left unattended for a long time. The open applications are stored on the hard disk, which subsequently powers down, the monitor turns off, and the processor turns off going in for hibernation. On soft rebooting like a restart or wake up on LAN, the processor turns on, the laptop wakes up, and the same exact settings are restored. Both these modes should be used to conserve battery power. You can preset your preferences in the settings of your notebook, so that in case you doze off, or leave the device for a coffee or a snack, the notebook automatically goes into any one of these power saving modes.

Following battery-saving practices can also save notebook battery power. You should always adjust the monitor controls to suit the room lighting conditions. Dimming the contrast and brightness saves battery power besides providing relief to your eyes. Auto-save and auto-update features of applications start in the background without your knowledge and these should be disabled. External devices consume a lot of battery power, hence the usage of external mice, monitors, keyboards, optical drives, videocam, digital cameras, or any other device connected to the PC Card slot, VGA/ FireWire/ USB port should be avoided.

Increase the RAM memory, if an extra slot is available, as this puts fewer burdens on the hard disk, which consumes a lot of battery power. Avoid multimedia games while you are running your notebook on battery power. Similarly, avoid music or movies. Copy the CD/DVD on the hard disk and play it from there, instead of the optical drive. Disable WiFi and Bluetooth. Built-in wireless cards should also be disabled. Decrease or set to mute the notebook speaker volume. Turn off all preprogrammed scheduled tasks. All unused open applications should be closed. The general guideline is that when your notebook is on battery power, you should perform only such operations, which are the need of the hour. Rest of the applications can be performed, when your notebook is connected to the mains.

Keeping good care of the battery also prolongs its life. To maximize performance of nickel-metal hydride batteries, they have to be completely drained off before they are recharged. However, lithium-ion batteries do not need cycling/ conditioning, and they do not suffer from memory effects. Hence, they need not be fully drained off before recharging. When the notebook is not in use for an extended period, the battery pack should be removed to avoid battery leakage. Before removing the battery pack, you should charge it fully and then remove it, as all kinds of batteries should always be stored in a fully charged state. Do not store your battery pack along with metal parts, as this will short-circuit your battery.

Utilizing the built-in battery saving options and other means, you can significantly add one to three hours more in the total capacity of your notebook battery. Sometimes, in critical situations, like an important meeting, this extra hour of notebook battery power can help you clinch your desired deal.

This article is under GNU FDL license and can be distributed without any previous authorization from the author. However the author's name and all the URLs (links) mentioned in the article and biography must be kept.

Should you buy a desktop PC or laptop?

You really have no choice except of a notebook computer if your job or lifestyle needs plenty of travel every year. Your own notebook computer will help you a lot when you are out of your home or office.

Now-a-days, you can get laptops as powerful as desktop PCs. Laptops are available with high-resolution graphics, CD/DVD recording, large hard drives and even with more features.

However, if you're sitting on the fence and portability is not required as much, go on buying desktop computer with considering the following reasons:

Desktops are more expendable than laptops: - Desktop computers are quite plain easier to expand and upgrade (using USB and FireWire ports), especially the processor and your graphic card, though you can hang plenty of peripherals off a modern laptop.

Desktops are cheaper than laptops: - Desktop computer is even cheaper than a notebook, so if you don’t need it why you are paying so much. Jump to the desktop side of the fence which costs less and suitable for you.

Laptops repairing cost is much more than desktops: - For example, if your sound card fails with any reason you can easily replace it with any inexpensive adapter card. However, when your laptop creates such problem of sound hardware, you must pull out your wallet because you will not be able to fix it yourself, and the whole motherboard inside the unit will must be replaced.

Here we also figure out how to buy these once you made the decision?

Processor: - if you intend that you will use your machine for standard office tasks and internet browsing, does not matter it will do any processor. But if you are a heavy gamer or you need much more power the Intel Core 2 Duo chip is the better one then.

Memory: - As much memory your PC has installed, you would be able to run as much application at once. Upgrading memory in a desktop after you buy the PC is a snap, but actually its good to buy the amount of memory you like preinstalled with the machine.

Motherboards: - A new motherboard would deliver you smooth new technologies that you are missing right now. It would be faster, would be has Second-generation SATA connections, high-definition audio and even a Dual-card graphic. You should keep in mind to check either the motherboard you are buying has two or one USB ports in fronts or not, because of to plug in your USB memory drive and digital audio player etc.

Graphics: - Before going for shopping make sure what kind of Card will work suite in your PC. If you are a serious gamer and can pay as much go on dual-graphics-card. There are two types of cards, the one is removable from the board and the other is permanently soldered on the board. However we would recommend a discrete graphics board for gaming and an integrated graphics for other use.

Sound Card: - for office use you should buy an integrated sound card for your PC, but if you want to use the PC in your home then a dedicated sound card would be the better choice.

Hard Drive: - Its totally depends on you, if you plan on large amount of data, such digital images or multimedia files on your pc, Large capacity hard drive, opportunity to save more data. For normal use simply buy 40 or 80 GB that most of business users use these days.

Are you now ready and has made the decision to buy a desktop computer or notebook, visit http://computersnext.com where you can get these with the facility of comparing etc.

What do you do if your RAID server fails?

RAID server failure is one of the dreaded work hazards you may have to face sometimes at your workplace. You tend to become incapable and powerless when you are unable to access data with a click.
Data on a RAID array or volume can becomes inaccessible due to any of the following reasons:

• A faulty RAID controller
• Multiple hard drive crash
• Malfunctioning upgrade or faulty striping
• Defects with the MFT mount points.
• RAID controller failure or configuration changed
• Adding incompatible hard drives
• Hardware conflicts
• Software corruption
• Virus infection, software and operating system upgrades
In these above conditions, the following steps should be taken immediately to increase chances of getting critical files back:
• Shutdown the server and turn off the system. Do not try to reboot again. This may cause serious damage to your hard drive.
• Do not attempt to recover data by yourself, friends or PC repair shops. This may result in permanent loss.
• Do not continue to attempt a forced rebuild if you have already replaced a failed drive and tried to rebuild the array, but still can't access your data. This may wipe out your data. RAID data recovery utilities and software are not designed to restore data or rebuild RAID arrays from failing hard drives. This requires specialized equipment and professional training.
• Swapping hard drives or re-ordering drives in a multiple drive RAID array may cause overwriting the striping and parity. This makes it nearly difficult to reconstruct your RAID array and salvage your company's vital data.
• Seeking professional help from professionally trained data recovery engineers is the sanest solution. Most data can be recovered from crashed hard drives and malfunctioning RAID servers by these experts only.
What do Professional data recovery engineers do?
Professional data recovery engineers have specialized equipment, a thorough knowledge of hex, drive structures, MFT mount points and offsets.

The Professional engineers’ initial diagnosis determines whether each media device is accessible to their lab equipment. From all the data accessible to them from each media, they make a raw image onto a new media to help them analyse and assess the data loss. If some of the media is difficult to get hold of, they will test the components and closely check its internal condition to assess the level of physical damage sustained. The damaged components include electronics, read/write heads, magnets, drive motors and head assemblies.

The raw images of the entire server’s media are used for logical recovery by examining the low-level data sectors. Determination of both the exact layout of volumes, which span or are striped across multiple drives, is a must. Necessary fixes to the file system structures are to be decided upon to get access to important data.

Servers that work on multiple drives are usually “destriped” onto a different media so that file system repairs can be done and the data files retrieved. It may be necessary to extract data directly from one or more fragments of the destriped image.

Professional programmers in this field have created a full set of software tools used by data recovery engineers to analyse, destripe, fix & recover data from raw images drives to virtually all operating systems. The Validity of information is checked once a recovery has been successfully performed, and file lists created.

A file recovery list is produced when your data is recovered. You can verify that your critical files are recoverable. The process usually takes 3-5 days though emergency data recovery services are also available.

Notebook Purchase Review

In the early nineties few people could image the impact that notebook would have in the computer industry. Its unique portability made the notebook a product in a class by itself. Soon, it became a must-have product, to those who were constantly moving from office, home or school. Nowadays, it is one of the best selling computer hardware items of all times.

With a Notebook, you can carry your work around conveniently, without having to worry about the myriads of wires, hardware and space needed to keep a desktop. Also, you can choose whether to work from office or home. A Notebook is really handy in any situation.

Portability and mobility are the great advantages of having a Notebook, or laptop. In your Internet search prior to buying a Notebook, you will be presented with a great variety and quantity of information. This can be quite bewildering, so you have to know what features you need in a Notebook.

Upgradabeality is an important consideration: the Notebook you choose now may be the one best suited to your current needs; but in future, you may find it necessary to upgrade it. You will not want to invest valuable time and money in purchasing a Notebook which you will have to discard or sell off in the near future, because of what you might feel as the inadequacy of your current one. When you consider upgradabeality, you have to think of memory or RAM, and hard disk space.

The CPU, or Processor, is the engine which will drive your Notebook`s performance. So you should choose the fastest CPU that is available, depending on your budget and on what you will be using the Notebook for. Tasks like word processing, emailing and surfing the Net do not require a fast CPU. But using CPU intensive applications, such as processing spreadsheets or playing games will work better with a fast CPU.

The RAM, or memory is another important feature, and the more memory you have, the better. Your Notebook`s performance will be greatly affected if you do not have sufficient memory. The minimum recommended these days is 1 Gigabyte of memory. Some experts recommend a minimum of 2 Gigabytes. The more memory you have, the better the performance and multitasking you can expect from your Notebook.

The speed and capacity of the hard disk of your Notebook are important, for this is where you will install all your software and your data (documents, database, photos etc). Make sure that you have enough room to store all your information which can be readily accessed. 40 Gigabytes of hard disk space is considered the minimum these days. Consider getting a Notebook with 80 Gigabytes of disk space.

Do note that Apple Notebooks are now using Intel processors, which means that if you have a hard disk with sufficient disk space, you can partition your disk drive and install both Apple Mac software and Windows software, and switch between the two.

You also have to consider the screen of your Notebook, for this is what you are going to be staring at, and you have to be happy with its resolution and size. You will want a crisp, bright screen with good viewing, especially for photos. You can go and look at different screens at a local electronics store, and try to figure out which size and resolution you like best. Just be sure that the screen is an Active Matrix one and not Passive Matrix.

The other features you will be looking at to connect to your Notebook are external devices such as a mouse, printer, portable disk drive, scanner etc. Good luck!

This article is under GNU FDL license and can be distributed without any previous authorization from the author. However the author's name and all the URLs (links) mentioned in the article and biography must be kept.

Data Transfer Made Easy By Pen Drive

Pen drive is the ideal for people who are looking for bigger space to store their data and want an easy-to-operate storage space. Transferring large quantity of data from one computer to the other has always been a problem, mainly due to lack of suitable data storing device. Storage mediums like CD, floppy and e-mails have always failed us in urgent times because of their shortcomings like small storage and large time-consumption for data transfer.

Pen drive is the best solution to end this problem. These USB flash drives are integrated with a USB interface. They are small, removable, lightweight and rewritable. Their main advantages over other storage devices are that they are faster, more compact, can hold more data and are much more reliable thanks to their durable designs and lack of moving parts. It is the revolution of pen drives that more and more computers are being made without the floppy drive while the USB port has to be present on almost every mainstream computer and laptop.

A pen drive consists of a printed circuit board generally in a metal or plastic. The memory storage of pen drives range from the usual to 250MB to 2GB or more. It is as small as a key-ring. For the pen drive to work, both the computer should be USB-compatible systems.

Pen drives are faster to use than downloading data through e-mail and easier than using dozens of floppies. Pen drives can store data, video and audio files, with plug and play ease. The best feature of a Pen Drive is you don`t need any software to make it work thus simplifying your work of copying or transferring. Moreover, it also does not require any type of battery. These features make the pen drive totally portable.

You don`t need to install pen drive for Windows 2000, XP or ME as it is done automatically by the operating system. But for Windows 95/98/98SE, you need to install the drivers manually.

These pen drives are most popular amongst system and network administrators. They can load them with information about configuration and software that can be used for the system`s maintenance, recovery and troubleshooting. They also enjoy noteworthy success in the field of PC repair as a mean for transferring recovery as well as antivirus software to infected computers, and also allowing a segment of the data of host machine to be archived for emergency cases.

Pen drives act as Application carriers and are utilized to carry applications for running on the host computer without installation. Some applications that use this technique are U3 and airWRX. An open software platform, Portableapps also allows similar functionality on non-U3 drives. But undoubtedly the most common use of pen drive is for personal data transportation you can transport and store your personal files like documents, videos and pictures. You can also store certain medical alert data on Medic Tag flash drives to be used in case of emergencies and for preparation of disaster. Apart from this, pen drives are used in Audio players.

Pen drives present a considerable security challenge for big organizations. Their ease of use and small size allows unsupervised guests or unscrupulous staff to smuggle off confidential data with little or no chance of detection. To avoid this, some flash drives have features like encryption of data stored on them. This is a preventive measure to stop an unauthorized person from gaining access to the stored data stored. Newer pen drives support the biometric fingerprinting for confirming the user`s identity. This process though costlier is a better way to protect sensitive data from leaking out.

This article is under GNU FDL license and can be distributed without any previous authorization from the author. However the author's name and all the URLs (links) mentioned in the article and biography must be kept.