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A year ago, nobody had an iPad. dell xps m1530 akku Then Apple sold 15 million of them in just nine months, creating a whole new category of technology product. The iPad may have become, in the words of Steve Jobs, "the most successful consumer product ever launched."

It turns out that a lot of people saw the iPad's appeal: It's a supremely portable device that's well suited for checking e-mail, surfing the Web, playing games, reading books and other stuff you get off the Internet, and even for getting work done. Kids and the elderly have embraced it, too.

It's awfully hard to follow such a massive success, but that's the task set out for the new Apple iPad 2, which goes on sale Friday. At least the iPad 2 has one thing going for it: dell latitude d830 akku The original model caught the technology industry so flat-footed that only now are true competitors beginning to appear.

Those competitors will now face a new iteration of the iPad, one that's faster, smaller, and lighter than the model introduced a year ago--all while retaining the $499 entry price that has proven all but impossible for Apple's competitors to match.Sony battery It's almost unfair.

Call it Jobs's Law if you like: The latest version of any Apple product is likely to be thinner and lighter than its predecessor. And so it is with the iPad 2. The size difference between the original iPad and the iPad 2 may seem slight, Lenovo battery but that's only because we're dealing with such small products to begin with. But for products this compact, every ounce and fraction of an inch counts.

The iPad 2 measures 7.31 by 9.5 by 0.34 inches, and weighs 1.33 pounds (in the case of the Wi-Fi-only version, that is--the AT&T and Verizon 3G versions are 0.01 and 0.02 pound heavier, respectively). Acer laptop battery That means Apple shaved 0.17 pound off the Wi-Fi version and 0.26 to 0.27 pound off the 3G version. The iPad 2 is also 0.16 inch narrower, 0.06 inch shorter, and 0.16 inch thinner than the original iPad.

A matter of small degrees, to be sure, until you consider the percentage change: The iPad 2 is roughly two-thirds the thickness of the original iPad, and 88 percent of its weight (83 percent when comparing 3G models). Pick up an iPad 2 after handling an original iPad, and you'll notice the difference right away. This is a lighter, thinner device.

In order to shave off that 0.16 inch of thickness, Apple has transformed the anodized-aluminum back panel of the iPad. The original model's back panel was a frame with four flat edges and a gently curved back surface. Apple laptop battery The iPad 2 eschews the frame, opting for a single surface that much more rapidly transitions from curve to flat. (This has the effect of making the iPad 2 much less wobbly than the original when laid on a flat surface.)

Without those edges, the iPad 2's ports and buttons are now positioned on a curving portion of the back panel, rather than on its side. The feel is quite different, a bit like reverting the flat surfaces of the iPhone 4 to the curved back of an iPhone 3G. Asus laptop battery A few times I found myself struggling to insert cables into the iPad 2's dock connector at the proper angle because I was confused by the curve of the back panel.

The end result of all this slimming down is that the iPad 2 is easier to handle than the original model. In my review of the original iPad, I said it was "heavy enough and slippery enough that I found it difficult to hold in one hand." Dell laptop battery In fact, the original iPad turned out to be a product that really demanded a case of some sort, just to make it easier to handle.

The iPad 2 is easier to carry with one hand, and the decreased weight makes it easier to hold for longer periods of time. But if you're planning on using the iPad 2 to read a lot, you'll still find yourself propping it against your chest or setting it on a table--the tablet is still not light enough to hold in one hand for extended periods of time.HP laptop battery (For that, you'll need something more on the scale of the Amazon Kindle 3, which is less than half the weight of the iPad 2.)

What Hasn't Changed

Although it's thinner and lighter, the iPad 2, at a glance, looks very much like the original iPad. Its front is a sheet of glass over a bright 1024-by-768-pixel display surrounded by a bezel (again, now available in black or white) Fujitsu laptop battery that's going to be necessary so long as humans grasp with opposable thumbs. The aluminum frame around the outside of the bezel of the original iPad has been reduced to a thin edge, almost entirely invisible, in the iPad 2.

The position of the iPad 2's buttons and ports are, likewise, more or less undisturbed.Toshiba laptop battery A sleep/wake button sits at the top-right edge, a standard headphone jack is at top left, a volume rocker and a sliding switch (configurable to lock screen orientation or mute alert sounds via the Settings app) are at the top of the right side, a 30-pin dock connector port resides at the bottom, and a home button sits at the bottom of the front face. Sony laptop battery The iPad 2's built-in microphone is dead center at the top edge of the device (it was next to the headphone jack on the original iPad). Both 3G models feature a black plastic cutout along the top rear face in order to improve cellular reception; the AT&T 3G model also has a micro-SIM card slot along the top-left edge.

The iPad 2 uses a new Apple-designed processor called the A5, which is making its first appearance on the scene. Apple is generally cagey about tech specs for products like the iPhone and iPad, but by all accounts the A5 is a dual-core version of the 1GHz A4 chip that powers the iPhone 4 and the original iPad. Apple laptop battery The iPad 2 also has 512MB of RAM--twice that of the original iPad--and a 200MHz bus speed, likewise twice that of the original.

Because the A5 is a dual-core processor, Apple claims that the iPad 2 can run at speeds up to double that of the original iPad. As with any dual-core processor, the key about "up to double" is that software must be optimized to take advantage of multiple processor cores, or that speed goes to waste. This is the first dual-core processor to appear on an iOS device,Asus laptop battery and it'll be interesting to see under what circumstances the A5 is noticeably faster than the A4, and when it's not.

But processor speed isn't the only part of the system that determines how it performs. Graphics performance has become a major component in determining how fast a computing device feels. Dell laptop battery And Apple says that the graphics performance on the iPad 2 is as much as nine times faster than on the original iPad.

So does the iPad 2 measure up to Apple's claims? Absolutely, though it's hard to determine whether the dual-core processor or the improved graphics performance deserve the credit. (Maybe the question is moot.) From the moment I started using the iPad 2 with familiar apps from my original iPad, I could tell that the system was faster.HP I thought scrolling through tweets in Twitterrific on my iPad was smooth as can be--until I scrolled through the tweet list on the iPad 2. Everything felt smoother, and items loaded faster.

Part of the speed boost, especially when I started to test performance in Safari, probably needs to be credited to iOS 4.3, which ships with the iPad 2 and includes a dramatic improvement to Safari's JavaScript engine.dell vostro 1310 akku When I installed the golden-master version of iOS 4.3 on an original iPad, performance improved as well. But even when both devices were running iOS 4.3, the iPad 2 was 1.6 times as fast as the original in running the SunSpider JavaScript test, and 1.9 times as fast as an iPhone 4 running the iOS 4.3 golden master.

In short, the iPad 2 is the fastest iOS device ever made, by a long shot. And it's not just an academic distinction: dell latitude e6400 akku You can sense the speed when you use it, because everything is faster and smoother than it was on the original iPad.