The Micro SD memory was developed, tested and released on the market in 2005. Created by the SanDisk Corporation the format was originally called T-Flash a shortened version of Transflash, a name which is still used today. The name change was due to the Micro SD’s inclusion into the SD Card Association as its newest member. The SD Card

Association purpose serves as the organization with the mandate to promote the SD memory card as the existing industry standard
Micro by definition means small or if you want to get technical, one millionth of the base unit. However you like to call it the Micro SD is tiny. How small is this card? It is about a quarter of the size of an SD Card or your shinny red penny can cover it. It is also the size of a fingernail, so as you can see it is really micro

Types of MicroSD

At launch there were three sizes of Micro SD, 32, 64, and 128 MB. 256, 512 MB 1GB & 2 GB cards followed shortly. Many people search for 3GB micro sd cards, but they are unavailable, Click Here to understand why. There are plans to release a 4GB MicroSD, that should be around mid 2007 before we see these on the consumer market.

Right now there is the standard mini Secure Digital Cards (miniSD) and the ones that are High Capacity (miniSDHC). The standard miniSD cards are available in sizes from 4 MB upwards of 2 GB. The miniSDHC cards go from 4 GB – 32 GB.

There has been some confusion when it comes to the use of these new miniSDHC cards. The new format makes these cards unreadable in older devices, unless they have a firmware upgrade. Many people end up purchasing these cards and find out that they cannot be used in their older electronic devices.

Uses of MicroSD

Motorola was the first mobile phone manufacturer to adapt microSD as the standard for its newest mobile phones. The small form factor was a match made in heaven for mobile phone manufacturers. Phone developers such as Nokia, Samsung, Sharp, Panasonic, Toshiba and NEC have come aboard and are using microSD as the new standard.

The size of the micro SD memory card has allowed manufacturers outside the cellphone industry to incorporate it into its design. You can now see micro sd transflash being used in handheld GPS devices, cameras, video game systems and many more electronic gadgets.

What makes the microSD/transflash the memory card of the moment is apart from its minute size, it can also be used in devices that use other memory card standards. This is mainly due to the fact that it can fit in adapters. It can be used in any device that uses Secure Digital memory cards, as long as it is in the compatible SD adapter.

Specifications of MicroSD Memory Card

Known Names

Micro SD is known as microSD; this is the official name but many people place a space between the words. Transflash or TFlash is another name used to describe Micro SD. This was the original name before it was changed once it was incorporated into the SD association.

Storage Size 16 MB, 32 MB, 64 MB, 128 MB, 256 MB, 512 MB ,1GB and 2 GB.

Transfer Speeds Standard:

Maximum write speed: 10 MB/s

Maximum read speed: 10 MB/s

66 X

66 X

Physical Dimensions Millimeters: 11.0 mm (W) × 15.0 mm (H) × 1.0 mm (D)

Inches: 0.43 (W) x 0.59 (H) x 0.04 (D)


Voltage 3.3V

Copyright Protection Yes

Write Protection No

Advantages Small

Designed for mobile phones

Compatible with other memory cards formats, if adapter is used

Supports CPRM, SD and smartSD security

Disadvantages So small, possibility you can lose it easily