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Memory foam cheap air jordan youth , the visco-elastic material that temporarily keeps whatever form you press into it, is mostly associated with memory foam mattresses. The most famous memory foam mattress brand is Tempur-Pedic, the very company that helped NASA to develop the material. It is one of the more premium brands, but there are at least two other quality brands worth noting.


Sensus


Sensus memory foam generally has a density of 5 pounds per cubic foot. This makes for a high-density mattress or mattress pad. It will last you at least 10 years cheap air jordan womens , softening a little over time. It has an ILD (Indentation Load Deflection) of 14, which means it is a soft sort of foam. Sensus carries memory foam mattresses almost as good as Tempur-Pedic, at lower prices.


Serta


Serta is a large bedding company, formed in 1931. They decided to start offering memory foam mattresses and mattress pads in the 1990s cheap air jordan mens , and their product quality is high, but their customer service is not very knowledgeable. If you buy a Serta memory foam mattress, go to a dealer or small retailer of their products, rather than the manufacturer.


Tempur-Pedic


Tempur-Pedic is the industry leader in memory foam. They offer three mattresses cheap air jordan for sale , each a different thickness, with different levels of firmness. The Classic is the firmest at 8?. It has a base layer of 4.3?. Air is allowed to flow through this base layer and the top two layers, with the top layer being the softest. The Deluxe is thicker at 10?, with a two-level base layer that is doubly aerated for more airflow cheap air jordan retro , thus allowing for a softer and cooler sleep. The Celebrity is over 13? thick ? the softest memory foam mattress Temper-Pedic has to offer. Most other companies offer these variations in memory foam mattresses, but Tempur-Pedic was the first.


How to Protect Discs (CDs, DVDs) from Data Loss Computers Articles | July 26, 2007
Computers are an amazing feat of engineering. They are built around powerful processors that can make millions of calculations per second. This computing power is leveraged by specially made software to do a variety of tasks in a fraction of the time and effort it would have taken to do them manually.

Do They Make Good Backup Media? Computers are digital machines cheap air jordan shoes , that is, they can only process information by converting them into a digital form. In their routine operations, computers generate a huge amount of digital data. This has to be stored somewhere for safety and easy access. The primary storage device in a computer is a hard disk. It is made up of many circular platters that have a magnetic coating on the surface. All data is stored on this surface as distinct patterns which are read by a read write head. Hard disk is a non-removable storage media ? it is screwed to the insides of a CPU and is connected to the motherboard. (This is why it is also referred to as Fixed Disc Drive or FDD for short.) This poses a problem. What if one has to carry some data with them to another location? To fulfil this need, a variety of portable (removable) digital storage devices have been invented. These use different ways to store data ? as magnetic patterns cheap air jordan , electric charge or an etched surface ? and are quite small and can easily fit into a shirt pocket. Some examples include flash memory cards, USB drives, CDs, DVDs and floppies. Currently cheap real jordan shoes , the most popular removable data storage media in the world is the optical discs. These are of two types ? compact discs (CDs) and Digital Versatile Discs (DVDs). Both of these are circular discs made of plastic. These can be further subdivided into two categories ? those that can be written only once and others which can be written over again and again by deleting the previous data. The CDs were introduced in the early 80s originally to store audio files for use with music equipment. Seeing their popularity and features, they were quickly adapted for use in computers too. A CD can typically store about 700 MB of data, which is a huge leap over earlier portable storage media like floppy disks that could only store data of about 1.44 MB size. Amazingly, a CD can store data worth 500 floppies! The introduction of CDs fulfilled a long-felt need for a portable storage media ? light and small ? that could carry a substantial amount of data easily. The DVDs are a further development of the CD technology. They are of the same size as the latter but hold about 4.7 GB of data. This means that a DVD can hold as much data as about 7 CDs. One key feature of DVDs is that some of them can store data on two layers on the same surface and increase the data capacity to a whopping 8.5 GB. All optical discs have a shiny surface on which is written data as a pattern of microscopic pits. This is read by a laser which bounces off from the surface back to the sensor (this is why CDs and DVDs are called optical discs). Each pit represents 1 and its absence represents 0 cheap discount jordan shoes , thus allowing data to be stored in a digital form. CDs and DVDs are very tough, made of durable plastic. They do not disintegrate and get bent or broken till a considerable force is applied. Data on them can safely be stored for a long time. These are ideal for home users and corporate executives because their capacities ensure that they can accommodate all the data files that are ordinary generated and saved by the users. Optical discs are quite portable and light and many of them can be carried around in a small box. The only consideration in maintaining CDs and DVDs is to ensure that their surface remains clean of all stains and blotches and it does not get scratched. Such surface corruption can damage the patterns of pits that are read by the laser. If this happens, the computer cannot comprehend what is written on the disc and data loss occurs. When not being used by the computer, the disc should always be kept enclosed in a plastic case to protect it from dust and scra.