SD & Micro SD Memory Card Buyer's Guide

SD card is a short name of Security Digital Card [but it is not secured like it's name :)]. This kind of memory is designed to collect data from Digital Camera, Cell Phone, PDA and data can be stored for long time without any energy provided. SD card structure is none of machanical system so it will not broken when there are movement while the memory is accessed.

The mini SD card was developed to meet industry demands for downsizing mobile phones. It is only 37% the volume of an SD Memory Card. Despite its tiny size, the miniSD card offers all the benefits of the original SD Memory Card, including copyright protection. By inserting the miniSD card into the miniSD adapter, you can share a variety of digital data among standard SD-enabled products.

MicroSD is axactly the same memory card as TransFlash. MicroSD is completely compatible with and has the same dimensions as TransFlash memory card. MicroSD has been introduced by the SD Card Association as their new form factor memory card. MicroSD is the world's smallest memory card and is designed specifically for the new generation mobile phones, which will need large storage capacities for multimedia applications, such as digital music, digital photo, video, videogames, organizers, MMS and email.

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Today 8 GB SD Card can be found! That mean you can collect about 5,000 high resolution photos or over 1500 MP3 Music on this card. But before you buy the high capacity memory card, please see the manual of your digital product what is the maximum capacity competible whith it.
The standard capacity of SD Card is 2 GB. So you can find many brands of SD Memory card offer 1 or 2 GB SD or Micro SD Card.
You should ask your self what kind of data you would like to keep. Video files need more space, it is good idea to buy the big capacity sd memory cards minimum 1 GB and 2 GB is also good choice . Photos & Music are also need space for them but 1 GB is enough.

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Use this information below to determine how much you can store multimedia files on your SD Memory Card.

Capacity :
1.3MP Photos/3MP Photos/5MP Photos/MP3&WMA/Video

1GB SD Memory Card :
1572/904/595/190/68

2GB SD Memory Card :
3144/1808/1190/380/136

4GB SD Memory Card :
6288/3616/3380/760/272

8GB SD Memory Card :
12576/7232/4760/1520/544

Remark
1. Some of the listed capacity is used for formatting and other functions and is not available for data storage.
2. Numbers are approximations and estimates, results may vary based upon compression rates and devices used.

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The SD Card Association (SDA) has established SD Specification Version 2.0 for the SDHC (SD High Capacity) Memory Card. This type of SD Card has improve some performance as following. Change file system from FAT 12/16 to FAT 32 to support upto 4 GB file size. Increase speed of read & write.

To use this type of SD Memory Card please make sure that your digital product is competible with. You can looking for the logo SDHC printed on your digital product or read the manual before you buy the SDHC.

If your digital product support SDHC. The normal SD Card aslo competible with it.

SDHC cards adhere to the SD Speed Class Rating specification which defines a minimum sustained transfer speed and use the FAT32 file system. The SD Speed Class Ratings specify a minimum sustained write speed for SDHC cards (Class 2: 2 MB/s; Class 4: 4 MB/s; Class 6: 6 MB/s) - that's MegaBytes not MegaBits.

You can see the speed class printed on the SDHC memory card.

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Today SD Card manufacture is develop the technology to improve the speed of SD card. You can see the Hi Speed SD Card offer with a liitle bit more expensive price. You may see the word Ultra, 133X, High Speed which there are no standard vertified. Anyway the same brand of SD Card, the hi-speed model is always faster than the regular model. And please note that the capacity of SD or Mini SD Card does not effect to the speed of them and more speed is mean more power & time saving.

Until now, the various companies making SD cards have used their own way to indicate the data transfer on SD cards, and many times it wasn't possible to know if the card would meet those performance claims when used in an actual device.

This is why the SD Association created the "SD Speed Class" standard for data transfer speeds. In the future, the "SD Speed Class" will be indicated on compatible devices and cards, and it will be simple to select a card by the transfer speed. Now, three types of cards have been specified, Class 2, Class 4, and Class 6.

Speed Class 2 : Transfer speed is a minimum of 2MB/sec.

Speed Class 4 : Transfer speed is a minimum of 4MB/sec.

Speed Class 6 : Transfer speed is a minimum of 6MB/sec.

The transfer speed when reading/writing depends on the compatible device and card, and they belong to their own respective classes, and the class that the device or card belongs to is indicated by a mark on the product or the package.

The transfer speed is based on the result as measured under conditions regulated by the SD Association.

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SDIO (Input/Output) card is an interface that extends the functionality of devices with SD card slots. A variety of SDIO cards are being developed, such as a Camera, Bluetooth®, GPS, and 802.11b.

Of course, the host device for the SDIO Card will also be able to use the SD Memory Card.

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