It is the smallest memory card that can be bought; at 15 mm × 11 mm × 1 mm (about the size of a fingernail), it is about a quarter of the size of a normal-sized SD card. There are adapters that make the small microSD able to fit in devices that have slots for standard SD, miniSD, Memory Stick Duo card, and even USB. But, not all of the different cards can work together. Many microSD cards sold on the internet and in stores have a standard SD adapter, so that people can use them in devices that take standard SD but not microSD cards.
TransFlash and microSD cards are the same (they can be used in place of each other), but microSD has support for SDIO mode. This lets microSD cards do non-memory jobs like Bluetooth, GPS, and Near Field Communication.
Some people have a hard time knowing the difference between the microSD and the newer microSDHC format. The SD and SDHC act the same, but not all devices are able to be used with the newer format. This is even true with devices that have been made by SanDisk like their e200 series of MP3 players. Using 3rd party firmware, SDHC reading can sometimes be done.
TransFlash cards are sold in 16MB and 32MB sizes. microSD cards are sold in many sizes, from 64 MB to 2 GB, while microSDHC cards are sold in sizes between 4 GB to 64 GB. (This is the biggest microSD card so far, and the microSDHC format can not store anything past that amount. microSD cards with even more storage will be in microSDXC format.)
Micro SD (Secure Digital) cards are currently the most compact data-storage format commercially available. Measuring 11 x 15 mm they take up barely any space which makes them ideal for expanding portable devices such as cameras or smartphones.
There are different types of Micro SD card you can purchase – and we don’t just mean the storage capacity. What’s really important here is that you look for the “class” of the SD card.
Many vendors advertise and sell SD cards based purely on storage capacity, but there’s no point in having a 32Gb SD card that makes your hard-earnt device slow and laggy! Be wary of any vendor giving ludicrous reductions on cards like “£144 reduced to £10″. If a deal looks too good to be true: 99% of the time it is.
Check out this screen shot of something like this on “Product Wiki” – reduced by over 90% to $10.98 … but essentially worthless! It states 2MB/s but does give any indication of what that allows you (or doesn’t allow you) to do.
Class 2
Class 2 Mirco SD cards give speeds of 2MB/s. These days this is pretty much useless – only really good for standard resolution video shooting. As most smartphones these days can shoot in HD Class 2 is pretty much obsolete. Do not buy a Class 2 Micro SD card! Also – beware of fake Class 2 cards – some vendors my claim it to be class 10, but it is actually class 2. Have your wits about you and look to well known vendors and reviews when making your decision.
Class 4 and Class 6
These classes of Micro SD cards give speeds of around 4MB/s and 6MB/s respectively. This allows you to record video in HD and shouldn’t hinder your device – but isn’t the quickest thing around.
Class 10
Class 10 is currently the golden standard in Micro SD cards with minimum 10MB/s speeds. A feature of many smartphones today is the ability to simultaneously shoot HD video while taking photographs. Only class 10 allows you to do this and also comes with a number of other (high speed) benefits.
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