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Micro SD Cards are a variant of the SD Cards- Secure Digital. they are flash memory cards that can be removed. they are used in portable electronics such as Cell Phones, Media Players, Video Games, Digital Cameras and expandable flash USB memory drives.

They are very small in size, therefore the name, MicroSD Card. These cards are used to store data in these electronic devices and this can be transferred to another device since the card is removable. When compared in size to a United States Nickel, the MicroSD Card is slightly smaller than the nickel.

The physical size of the card is: 15mm x 11mm x 1mm. it is a quarter the size of the regular SD memory card. by using an electro mechanical adapter that comes with the packaging of the card, the micro-SD Card can be used in place of an SD memory card ard, a Memory Stick Duo and a TransFlash Card.

The Micro-SD memory card is intended for use in extra small cell phones and other portable devices. they store files like data, videos, music and images.

Micro SD Cards have a storage capability from 64 MB to 2GB. The earlier versions of Micro-SD memory card were called TransFlash Cards. they had a capacity of 16MB and 32 MB.

Micro SD Cards evolved from Secure Digital Cards. The original format, called TransFlash was created by SanDisk. This is why these memory cards have complete compatibility with TransFlash memory slots. This was later purchased by the SD Association and renamed Micro SD, in 2005. When launched in 2006, this format had capacities of 32MB, 64MB and 128MB.

The difference between Transflash and Micro SD Cards is that, Micro SD cards support SDIO mode. This means that non-memory devices like Bluetooth, GPS and near Field Communication devices can be supported and enabled.

Like an SD Card, they can be used to download, store and play content.

When launched, Micro-SD Cards were very expensive, as their popularity grew, and demand increased, the prices fell to less than one-tenth the original price.

The MicroSD Card has 8pins, extremely small in size and its transfer speed is 100Mbits/sec.

These tiny memory cards enhance the electronic device. Data can be stored and transferred much faster and greater amount of data can be stored.

They should not be confused with the Micro SDHC Card. This is a high capacity format. The Micro SDHC Card’s capacity is from 4 GB up to 32 GB.

The SDXC format of SD Cards, which is the high capacity format will be introduced in the Micro DS Cards as well. they will then have a capacity of 2TB but this format is not expected to be released until the last quarter of 2010 of possible at the beginning of 2011. The first capacity will likely be 64GB and will be introduced to meet the expected high demand for larger mobile phone memory cards in the future with regards to smartphones recording in high demanding High Definition video. HD video files use about twice as much memory as a standard video file.

The Micro SD Cards find wide usage in the Cell phone market where they are often used to store data from cell phones such as music and photographs. with increase in cell phone usage, and improvements in technology and features in phones, the demand for these cards has also been rising and this trend looks set to continue well into the future.

Providing you with storage for your digital cameras, cellphones and PDAs, SD card (Secure Digital Memory Card) offers extra space to store data, images, and files. It is a flash memory card that uses 32x24mm form factor like the Multi-MediaCard (MMC). but it differs from the later in the sense that it is slightly thicker (2.1mm vs. 1.4mm), and its readers accept both formats. These cards are available with a storage capacity of up to 4GB.

SD Cards support encryption and content protection that is indicated by the word ‘Secured’. a user can ensure that the data he has stored are secured unless and until he takes the necessary steps to unprotect them. Thus, SD cards offer the benefit of ‘write protection’. so, fears of accidentally losing or changing data can be eliminated by using these cards. Still, these are used for regular storage due to their small size and fast transfer rate.

Mini SD and Micro SD Cards are the miniature variations of the SD Card. they were introduced with dramatically smaller footprints: the former in 2003 and the later in 2005. Electrically, as well as software compatible, both these variations fit into a regular SD slot via an adapter. one of the great things about these cards is that the user can choose the size, as well as the quantity to have on hand, according to his needs and budget.

One thing to be remembered while buying SD cards : if the resolution of your digital camera is high, you need a high capacity memory card. It cannot be determined as to how many images you can store on a particular memory card. It depends on various things like: the kind of the images, their file type and the compression rate per photograph. Typically, a 128 or 256 megabyte card is sufficient for an average photographer who use a 3-5 mega pixel camera.

SD cards or secure digital cards are constant companions to all kinds of cameras, may it be a pink digital camera, kids digital camera and mini digital camera; as well as electronic devices that have storage capability. These cards are non-volatile memory cards developed by SanDisk, Toshiba and Panasonic for use in portable devices. Standard cards can store up to 4GB but SDHC or secure digital high capacity cards can store up to 32GB.

The SD was conceptualized in august of 1999. it was designed to compete with Sony’s memory stick format. the signature SD logo was developed for another use, the Super Density Disc. the SD memory card is a highly sophisticated memory device that is about the size of a postage stamp. there are many types of SD cards available in the market for use.

Types of SD Cards
There are three basic types of memory cards. These types have normal SD card dimensions and are very handy and compatible with most devices. the advent of technology, wherein more devices are becoming smaller brought about the need for smaller SD cards.

4 GB card. This is the memory card of the regular size. This has various storage capacities, ranging from 2GB to 16GB.
4 GB Minicards. These are 37% smaller than the regular sized cards. These are compatible with smaller devices. They function exactly like normal cards. They have the same storage and speed of the SD card. These are sometimes used with adapters for transferring digital data to any SD enabled device.
4 GB Microcards. These are even much smaller than MiniSD cards. the mobile industry is the main reason why these cards were developed. These are used for mobile phones. it is one-fourth the standard size of an SD card.

Both the MiniSD and the MicroSD memory are backwards compatible. They can be used in place of the standard card as long as there is an adapter. MicroSD, on the other hand, also support SDIO mode unlike the other two. SD is less open than USB flash memory drives and Compact Flash. however, SD is much more open than Memory Stick. These memory storage devices can be accessed freely using the SPI/MMC mode.

How to buy 4GB SD Cards- Part 1
4 GB SD card memory is a small storage device that will allow you to read and write data easily without the bulk of large storage devices. there are many brands in the market so to make purchasing a memory card easier, follow the steps below.

Purpose of the card. what is the card going to be used for and what device will it be on? Consult the manual of the device before making a purchase to make sure that you purchase the right size of memory.
Establish the size you desire. A 4GB card I suitable for most devices but if you fell you need more then ask yourself what size you like.
make sure the computer has a card reader. Most new computers have card readers so this will not be too difficult. If you plan on using the memory card in your computer, it is extremely important that you be able to read and write files onto it. however, if you have an older model and if it does not have a memory card reader, you might need to purchase media card reader.

How to buy 4GB SD Cards- Part 2

look for USB 2.0 SD cards. Compared to the previous USB 1.0 versions, these are able to read and write data much faster. the faster storage speed you have, the better. Generally, the higher speed cards will cost more money. This information can usually be found written on the card itself, as well as on the packaging.
Check local stores and online merchants. once you have considered the aforementioned points, then it is time to make a purchase. Check Best buy or Walmart, or try online stores such as amazon.com.
Extras. Some cards have added features that may suit your needs. there are some cards that offer password protection for accessing contents. others have a switch on the side to secure the contents and protect them from being accidentally erased.

SanDisk 2GB Micro SD Memory Card has 2 GB of storage capacity, which is considered to be large storage flash memory card. It is specially designed for latest and compact mobile phones with multimedia functionalities. SanDisk being a leader in storage device has come out with unique solution to satisfy the need for large capacity with small and tiny structure. This card format is much suitable for upcoming mobile phones and 50% of these phone use this versatile format. This microSD card would offer reliable storage facility and equally perform well when compared to SD memory card. It is built under industry standards and provides complete compatibility solution. Sandisk being the first to launch 2GB of microSD memory card and it looks very tiny with overall dimensions of about H 2 x W 0.1 x D 0.3. It is one fourth the size of SD card and this card is been used by almost all the top selling mobile phones in the world.

This microSD card allows you to store large volume of digital contents such as music, videos, pictures and games. Sometimes this card could be used in MP3 player also and it shows good compatibility with such electronic devices. This microSD card is complaint with Secure Digital Music Initiative (SDMI). It comes with SanDisk adatpor, which lets you to use this microSD card with various types of devices that has SD slot and support mini SD card. It is available in various storage capacity and comes with memory kit that consists of SD adaptor and miniSD card along with the flash card.

With the help of SD card adaptor, you can easily plug this with SD enabled digital devices. This microSD card is available in 1GB, 512MB and 256MB of capacity range.

It has in built security features that enables you to safely download contend and save them securely.

This microSD card consumes less power and enables the mobile phone to have longer battery life.

Laptop computer memory is a complicated field. most commonly used are the SODIMM chips/cards. they are divided in to several groups and sizes.

SODIMM have the following sizes:

72pins
100pins
144pins
200pins
204pins

The 72 and 100 pin models only support 32bil data transfer rates, and as such are not in use vary much anymore. It’s important to understand that these modules are not interchangeable and you have to look at your laptops manual to make sure to get a module that is right for your computer.

Also keep in mind that with SODIMM’s and laptop computer memory the various laptop manufacturers have a strict policy about using only ram approved and sold by themselves. There is to my knowledge and experience no other reason for this then the warranty. These are mostly issues with the big manufacturers like HP and Lenovo but make sure you check before you make any modifications or order anything that might void your warranty.

There can be both price and performance gains in going with a raster rated SODIMM’s for your laptop. The important this except for the warranty issues are that you laptop computer actually supports the type of ram you want and that you can install it yourself.

It is worth noting also that the installation procedure can be a lot more cumbersome and require a few tools more then in a normal desktop computer. most newer laptops does however have a battery like compartment where the ram i supposed to be installed. it is also wise to check to see that you actually have room for more ram, or if you have to swap out one sodimm for another.

Read more about laptop computer memory

In the age of digital electronics, memory cards are changing the way we store and transfer data. Day by day SD cards are finding increased usage in mobile phones, cameras, camcorders, GPS navigation devices and gaming devices. The compactness of SD memory card make it the ideal choice for digital component manufacturers to use SD card based storage platforms to store and transfer images, music, video and other data.

The SD memory card comes in various capacities and transfer speeds and faster transfer speeds are associated with the capacity of the SD memory. These days, cell phones which come loaded with multimedia features with ability to capture photos and videos, are selling fast than the less endowed models. Some newer computers have a card reader built into the system, or an inexpensive external card reader can be purchased. Since there are many different types of flash memory cards, be sure the card reader is made for the SD memory card, or capable of reading various formats.

The type of memory card you use is dictated by which cell phone or digital camera you use and one feature of all the high end models is its amount of expandable memory space with SD Cards. The different types of flash memory cards for use in digital cameras are Secure Digital (SD), CompactFlash (CF), MultiMediaCard (MMC) xD-Picture Card (xD) and SmartMedia (SM) card. Most cell phones make use of miniSD cards. Being one of the smallest available flash cards in the market, these miniSD cards are meeting fast expanding needs of the consumer or the end user in a big way.

The memory and storage capabilities of the SD cards are getting bigger and faster with most SD cards manufacturers offering up to 32 with increase in reading and writing speeds of up to 150x speed and more. Most SD cards work on preformatted FAT or FAT 32 file system which allows the card to be accessed with just an SD reader which can be connected to any output or input. when shooting digital photographs, the performance of the memory card can be critical issue, that could have an effect on the number of shots and also on the writing quality.

This is more visible while shooting in continuous shooting mode or burst mode. To support continuous shooting at 3 fps or more the SD card should be capable of writing at high speeds, so that there is no time lost between one shot and the other. High-Capacity SD cards are equipped to handle higher data transfer rates and have speeds of 200x or higher.

For added reliability and durability, most CD memory cards have no moving parts that could wear out or break. All branded SD cards available in the market are 100-percent tested and free live technical support. There is also a new kind of SD card called the SDHC cards which are differently designed, these SDHC can be read by SDHC host devices.

Starting at 4GB, SDHC cards offer larger-volume data storage and optimized recording performance with support for FAT 32 file formats. SDHC cards use new class rating for speed that deliver a minimum data transfer rate for optimum performance with SDHC devices.

Hilden, Germany – December 11th, 2008 – SEGGER Microcontroller, manufacturer of the J-Link emulator, announces a new member of the J-Link product line.

J-Link ARM Pro is a refined version of the regular J-Link. it has an Ethernet interface in addition to the USB interface, as well as two additional LEDs which are used as hardware status indicators. When J-Link ARM Pro is used via USB it can be USB powered; for Ethernet use it is powered via the USB connector using a USB hub or the power supply that comes with it.

Furthermore J-Link ARM Pro comes with licenses for all J-Link related SEGGER software products: FlashDL, FlashBP, RDI, J-Flash, GDB Server, providing the optimum debugging solution for professional developers.

J-Link ARM Pro can be used with almost all ARM debuggers, enabling download to flash memory with an unlimited number of breakpoints when debugging programs located in flash memory of most popular ARM microcontrollers. it also comes with the license to use J-Flash, SEGGER´s popular flash programming software.

J-Link ARM Pro is fully compatible with J-Link ARM and can be used “out-of-the-box”. J-Link ARM Pro uses DHCP per default. the built-in webserver makes manual configuration easy and convenient.

all ARM7/9/11 and Cortex-M3 devices are supported; Cortex-M3 devices can be accessed via JTAG or SWD/SWO at high speed. the latest version of the J Link software can be downloaded free of charge from SEGGER´s website.

“Ethernet allows using the emulator far away from the PC in a development or production environment; download and debugging speed is higher and Ethernet provides electrical isolation from the PC”, says Ivo Geilenbruegge, Marketing Manager of SEGGER Microcontroller.

SEGGER Microcontroller develops and distributes hardware and software development tools as well as software components. all software components are ANSI “C” compliant and can be used in embedded systems including industries such as telecom, medical technology, consumer electronics, automotive industry and industrial automation. SEGGER software products include: embOS (RTOS), emWin (GUI), emFile (File System), emUSB (USB device stack) and embOS/IP (TCP/IP stack). Besides the highly efficient software products, SEGGER also provides embedded hardware tools such as the well-known JTAG emulator J-Link, J-Trace and the Flasher (stand alone programmer). SEGGER’s intention is to cut software development time for embedded applications by offering affordable, flexible and easy-to-use tools and software components allowing developers to focus on their applications.

for further information please visit: segger.com

Keywords featured in this article: microcontroller, connector, power, arm, debugging, programming, arm7, automotive, flasher, rtos, tcp

Memory foam has been about since it was invented in 1966, but it has only been by and large accessible for about twenty years, although twenty years ago hardly anyone could afford it.

One of the early applications for memory foam was for mattresses for the bed-ridden. This is because memory foam mattresses help reduce pressure on the skin touching the bed, which reduces the likelihood of bed sores and gangrene.

In those early days such mattresses were prohibitively costly so just hospitals and the wealthy could afford them. however, the price of memory foam mattresses has dropped sharply over recent years and now they can even be bought on Amazon and.

Initially this special foam was developed by one of NASA’s spin-off research businesses, so it is a product of the space program. At the time, scientists were trying to find a safer material for use in cushions and pillows for the aeronautical industry.

They came across this foam, but NASA allowed the right to manufacture it, the patent, to slip into the public domain.

A Swedish company took up the challenge and made orthopaedic mattresses with it because of its capacity to moulding itself to a body’s individual shape due to that body’s heat and weight, thus supporting the body at more points than a traditional mattress. It is this extra support that reduces pressure on the skin and so reduces the likelihood of bed sores.

Another property of memory foam is its composition. Normal foam is made up of lots of bubbles per cubic inch which are effectively sealed off pockets of air. You body heat warms this air up and so keeps you warm.

This can be a good or a bad thing according to the background temperature, but regular foam is always warm.

On the other hand, the cells or bubbles in memory foam are not sealed off entirely so air can course between them. that means that warm air can escape and be replaced by cool air.

This allows you much more control over the temperature of the mattress by controlling the temperature of the room.

There are two types of memory foam high density and low density. one reacts to heat and the other to pressure (or in this situation, body weight). Most memory foam mattresses are made up of a combination of these two types of foam so that the top layer reacts to the heat of your body and moulds itself around you, while lower layers react to your weight in the same way, depending on how heavy you are.

The lower layers will allow the passage of cool air and this will be transferred to the upper layer, keeping your body cool. one point to make on this issue is that because memory foam mattresses react to heat, if you live in a hot country, the foam will become fairly flaccid because of the background heat. Therefore, if you live in a hot country, the mattress will need to be that much thicker to permit more air to circulate.

SD and SDHC stands for Secure Digital and Secure Digital High Capacity respectively. both of these are portable flash memory. these are used extensively in portable electronic devices that include mobiles, audio and video players, PDA’s, GPS and many other devices.

Most new devices cannot read cards below 2 GB and require high storage capacity to function properly. As the name suggests the basic difference between the SD and SDHC card is the difference in the capacities. SD cards have the storage capacity that varies from 16 MB to 4 GB, whereas the storage capacity for SDHC card is quite high ranging from 4 GB to 32 GB. The newer specification for SDHC cards even allow for storage capacity greater than 32 GB.

The large storage capacity demands for greater read and write speed as well as the data transfer speed. thus the introduction of SDHCcards has caused new standards for the speed to be defined. therefore, another difference between SD and SDHC card is that all the SDHCcards come with the new speed class that is from 2 MB/s to 6 MB/s. On the other hand, only the new SD cards have this speed classification. The earlier ones do not have this.

SDHC cards have the file system FAT 32 while SD cards have a FAT 16 file system. SD cards use the byte addressing for the storage purpose whereas SDHCcards use sector addressing for storing data. Each sector in the SDHC card is of 512 MB and therefore has the maximum storage capacity of 2 TB, although new SDHC card specification will be required for this high storage capacity. this enables the SDHCcards to have better speed for storing data. The SD cards quote peak write speed whereas the SDHCcard will show the sustained write speed.

SDHC enabled devices also allow backward compatibility which in SD cards is only limited to microSD and miniSD card. this means that you can also use an SD card in an SDHCcard slot with an adapter. most of the SD card reader devices will not work with SDHC cards unless it has a firmware upgrade system of which most devices do not have.

The moving trend toward the SDHCcard was due to the increasing demand from the consumers for higher storage capacity for their devices. The other differences are all based on it as higher storage capacity demands some other changes as well. The SDHC cards have successfully met this demand of consumers and this basic difference is the main reason for the changing trend. Whatever differences SD and SDHC cards have the purpose for both remains the same, i.e. to provide data storage in a compact sized card using flash memory.

well I'm planning on selling a videocamera memory card, Its in mint condition bc my video camera doesnt work, Umm if It help: 2GB,kingston,SD. Its a small chip. SO how much should I sell it for?

They go for $6-7 on Amazon with free shipping, brand new, in packaging – some even offer an SDHC card reader.

You'd be good for $5-7 – locally sold could fetch higher prices ($10) because the buyer doesn't have to wait for shipping.

5-7$ is good price.