All about SD Memory Cards

“It seems incredible that a piece of plastic so small to be able to store as much information”. Most likely is that is the thought that crosses our minds every time we have in our hands a memory card. This reflection has, of course, a good solid grip. Those who that remember the old diskettes, with its huge size and its 360 Kb. of capacity, knows the hardships they suffered whenever had to store something that occupied more of this limitation.

Of course the computer at that time was much simpler, and scenarios to need more of that capacity, limited. But since those days until today, technology has advanced, allowing the creation of increasingly precise and complex instruments, and with them came the need to store the huge amount of data they generate or they need to function.

All about memory cards

It is currently not possible to think about to buy a device without accompany it with its corresponding SD memory card. We’re not just talking about digital cameras, but also video cameras, MP3 players, PDAs, GPS, smartphones, tablets, TV Box and many other electronic devices, each with its corresponding type of memory card. Therefore it is good to be informed about the various options that exist in SD memory cards, information that can be obtained easily if continues reading this article.

While on the market there a wide variety of memory cards from different manufacturers and with many different purposes, such as Compact Flash, Memory Stick, MultiMedia Card and others, the truth is that the most popular format memory card is called card SD memory, acronym of Secure Digital, the which has very good references of all who use it daily, and that is why it has become a standard widely used, together to their “brothers” Mini SD and Micro SD, the latter being the most widespread.

All about memory cards

Main features of the SD Memory Card

Some interesting features found on SD memory cards are its small size and large capacity, as well as its compatibility with all kinds of devices, points that will explain below in the article.

Formats SD memory cards

The format is asymmetrical, therefore no risk of being inserted by mistake on your computer, besides having a good small size:


Traditional SD Memory: 32 mm x 24 mm x 2.1 mm
Mini SD memory: 20 mm x 21.5 mm x 1.4 mm
Micro SD memory: 11 mm x 15 mm x 1 mm


Storage Capacity SD Card

The SD memory card offers different storage capacities: 8, 16, 32, 64, 128, 256 and 512 MB, although such cards are hard to find, as they have been replaced in the market for cards with much greater capacity: 8, 16, 32 and 64 Gb, and until they can even reach up to 128 Gb. of storage space. It is important to remember that not all computers have support for cards with 2GB or more, due to the difference in formatting (sometimes the problem is solved by firmware upgrade that computer).

All about memory cards

First, it is important to decide the storage capacity of the memory card. But we should not get a wrong idea, because the capacity bought never enough, much less in the camera of a teenager who is on vacation!

The fact that digital cameras offer more and more megapixels without increasing the price, creates the need for more memory to fit the photographs, a higher definition occupy more space.

All about memory cards

Card compatibility SD, MiniSD and MicroSD

In this sense, MicroSD type cards are more compatible than MiniSD and the SD type, perhaps because they are the most widespread type of memory market. Used by countless manufacturers of digital machines such as Casio, Canon, Nikon, Pentax, Kodak, Panasonic, Konica/Minolta and manufacturers of electronic devices around the world, are included with all kinds of devices like smartphones, tablets, PDAs, mp3 players and much others. However, if your device only accepts SD cards type, also called Transflash, this is not inconvenient to use, because in the market there are adapters that can convert a MicroSD or MiniSD memory card into SD type.

SD memory cards safety and security

The SD memory cards have a physical lock system which prevents the writing on the card, similar to the recording obstacles included in the old 3.5 diskettes, although the market we can find cards cheaper models without this feature. However, unlike diskettes, this blocking is performed by the firmware of the device detects that the key is activated.

The card contacts are placed in a depression of the card, so as to avoid contact with the dirt left by hands and other materials.

All about memory cards

Memory cards speed

Memory cards can have different transfer rates (which also varies in price), according to the version used. Speed is measured in multiples of 150K (equal to CD-ROM). The most usual is to find cards or equipment that use up to speeds of 16x (2.4 MByte / sec), and some faster than 66x (10 MByte / s), although they can also be ultra-fast 150x or even 133x cards.

In fact, many times the speed and capacity to transfer data to the computer of these cards can only be exploited if we have a USB 2.0 port. However, if you are thinking of using more advanced equipment and professional semi-professional camera, or SLR, will certainly better benefits in the use of faster memory cards.

Memory card peed table


4x: 600 KB / s
16x: 2.4 MB / s
32x: 4.8 MB / s (SanDisk Pro)
66x: 10MB / s (SanDisk Extreme, SanDisk Ultra II)
133x: 20 MB / s (SanDisk Extreme III, Lexar Professional)


Other functions:

Because of its great popularization, the SD Card Association, entity responsible for the standardization of this class of devices, defining today the new features and applications such as the ability to add a Wi-Fi device within the card itself, devices that can already be found in some electronics stores.

All about memory cards

Examples of such implementations are:

SD Card with Copyright, used for film distribution, which allows the user to purchase an SD Card containing a DVD movie format, which can be played on computers and portable devices like PS3.

Using SDIO technology, which allows, using the dimensions of the card and using their pins, the use of devices such as Bluetooth and Wi-Fi receivers, among others.

While this format is here to stay, there are significant differences in features, capacity and price. It is therefore necessary, before buying, learn more to better select the model that will bring the expected result in our equipment.

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Tips for buying wireless headphones

In a further step towards the direction of a world free of cables, modern models of existing headsets on the market today provide us with an experience and ease of use that cannot be compared in any way to the old method.

Be tied to the sound source via a cable, it is not exactly a pleasant way to listen to music, especially considering the ease that now offer stereos with all your lists functions to be used by remote control.

Tips buying headphones

Moreover, basically, the wireless headset market is dominated by three sound transmission systems: RF (Radiofrequency), IR (Infrared) and Bluetooth.

In the case that we are about to purchase a pair of wireless headphones, it is wise to know some useful tips to make buying intelligently. In this way we can invest the money wisely, buying a product that really suits our needs as a user.

While buying headphones, we must consider a number of parameters to decide which of the three transmission systems is best for us.

Is very important to keep in mind that not all headphones are designed for the same purpose. In the market we can find a wide variety of models covering most user expectations.

Tips buying headphones

Usually in audio or computer stores, we can find models of wireless headsets for indoors, which can be easily recognized thanks to its size and weight, but also are very extended the headphones for MP3 players, mobile phones or computers, lighter, suitable for easy transport and use.

Notably, most of these models incorporate noise cancellation technology to avoid any interference from electrical or similar machinery.

The range, signal coverage and sound quality are determining factors in buying. Consider that if you acquire a certain type of system with the required parameters to be used in a small environment, this equipment will not serve us in larger spaces, and vice versa.

It is also very important to remember that each of the systems used by manufacturers has advantages and disadvantages depending on the type of use in which we will use.

Tips buying headphones

In this sense, the RF, or Radio Frequency, as also it called, offers an excellent coverage distance of almost 100 meters, and a radius of listening to 360 degrees, making it ideal for use in large areas and abroad, the truth is that it susceptible to interference.

In the case of systems IR or infrared are a good choice for when we are tied to a fixed device, as its range is limited by a line of sight, i.e. the components that make up the system must “see” among them for to reach its maximum gain and fidelity.

As for Bluetooth, it stands out as a technology that is incorporated virtually all modern devices, and manufacturers take advantage of this presence to work with audio, but Bluetooth is not distinguished by their audio quality or its scope, and that is why there are some attempts to try to produce a combination of both with the objective of achieving better range and fidelity in the market.

Tips buying headphones

Another point very important to evaluate when buying wireless headphones, is the aspect of autonomy they offer. In this point we have to figure out the time it takes to charge the battery once discharged, some models can reach up to 16 hours. It is also important to know the period of full autonomy before discharge.

Another important consideration to take into account is the ease of use of headphones and weight, and also that it provides some broad helmets to completely cover the ear, an aspect that directly affects their sound quality and mainly in low frequencies.

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