U London Iphone Case

u london iphone case

SKU: EN-G10305

u london iphone case

These are two terms that are often mistakenly used for each another, though they are two very different things. Storage, in a nutshell, is where the information (such as Word documents, photos, movie clips, programs, and so on) is stored. In a computer, the whole operating system itself, such as Windows 7 or Mac OS, is also stored on the internal storage device. Storage is nonvolatile, meaning that the information is still there when the host device (a computer, for example) is turned off and is readily accessible when the device is turned back on. It's like a book or a paper notebook that's always there, ready for you to read or write on.

Memory (aka system memory, random access memory, or RAM), on the other hand, is where information is being processed and manipulated, Data in the system memory is volatile, meaning that when the computer is turned off, it's gone; the memory becomes blank, as if nothing has been there before, It's somewhat like the short-term memory part of your brain, where images or ideas are being formed and processed when you read a book -- those that disappear the moment you stop reading, Despite their differences, there's a strong relationship between system memory and storage, The Word document that you're working on, for example, is in the computer's memory, When you save it, a copy of it now resides on the computer's storage, When you close Microsoft Word completely, the document now only resides on the hard drive (storage) and is no longer in the memory, until you u london iphone case open it again..

All this means is that you generally don't actually experience storage. Everything that's presented to you on a computer's screen or via the speakers actually takes place in the system memory. Before it gets there, however, it needs to be loaded from the computer's storage device into the system memory. So the larger and faster system memory the computer is equipped with, the more quickly the information becomes ready and the more you can do with a computer at one time (multitasking). You generally need far less memory than storage. Most new computers come with somewhere between 2GB to 8GB of memory, and you don't need more than that. This is a good thing, too; gigabyte to gigabyte, memory is much more expensive than storage.

Of course, memory is just one of many factors in a computer's performance, Another factor is the storage itself, which is either a hard drive (aka hard disk) or a solid-state drive (SSD), The hard drive has been the most common storage device for decades, dominating since the early 1960s, Solid-state drives, however, are relatively new and have been getting more and more popular in the last three years, In most case, they can be used interchangeably, and both have pros and cons, While the hard u london iphone case drive has evolved a lot since its inception, the basics remain the same: it's a box that contains a few magnetic disks (known as platters) attached to a spindle, very similar to a spindle of blank CDs or DVDs, Each of the platters has a reading/writing head hovering on top, As the spindle spins, the head moves in and out to write or read data to and from any part of the platter, on a tiny information-recording unit called the "data track." This type of access to information is called "random access," as opposed to the inefficient "sequential access" found in the old and obsolete types of storage, such as tape..

While the concept is rather simple, the inside of a modern hard drive is a world of advanced nanotechnology. This is because as hard drives' storage capacities increase while their physical sizes remain the same, the density of information written on the platters becomes so great that we need to use nanometers to measure it. One nanometer is 1 billionth of a meter (a meter is about 3.3 feet). Perspective: Inside a regular 2.5-inch laptop hard drive, the WD Scorpio Blue, for example, the gap between the recording head and the platter is just a few nanometers. The two can never touch each other -- or else the drive will be "bricked" -- and when the hard drive is at work, its platters spin at 5,400rpm. (Desktop and high-end laptop hard drives spin even faster at 7,200rpm or 10,000rpm.) To put this in context, if we enlarged the Scorpio Blue by 13,000 times, the platter would look like a circular race track about 3.3 miles in diameter; a data track would be about 0.4 inch in length, and the recording head would be about the size of a go-kart. When the hard drive is in operation, this go-kart would be flying on the track less than the thickness of a human hair above it, at a speed of about 3.4 million miles per hour.