Micro SD and SDHC Cards
SD cards were formally known as T-Flash and later Trans-Flash and produced by SanDisk. The year 2000 saw the SDA (secure digital association) formed by three major companies Matsushita, Toshiba and SanDisk. The association then took over the development of the new storage device to be called the SD cards. - sdhc vs sdxc
The micro SD is the smallest memory card in today market, its size 15mm-11mm-1mm and are used in mobile phones, digital cameras, hand held computers and gps devices and much more.
SDHC(secure digital high capacity)
The SDA designed a new card referred to as SDHC and it was created to 2. 00 specifications. The conventional micro card is similar dimensions but unless the host device recognizes the new specification it will not work. Both the micro SD and the micro SDHC are compatible with an adapter in devices using standard SD cards and often comes with a electro mechanical adapter for use in those devices.
STORAGE CAPACITY
The micro SD/SDHC Cards can be obtained with the following storage capacity:
micro SD: 32/MB, 64/MB, 128/MB, 2/GBs
micro SDHC: 4/GBs, 8/GBs, 16/GBs, 32/GBs
WHAT IS DTR?
DTR stands for data transfer rate.
microSD (DTR)
The pace in which the memory card will except information being stored, or in that the rate is reads from your card. The standard micro SD includes a data transfer rate of 100 Mbit/s plus a maximum SPI rate of 25 Mbit/s which os optional, it's 8 electrical contact pins around the underside the same as the micro SDHC. - sdhc vs sdxc
microSDHC (DTR)
The SDHC is available in four memory sizes as we now know but each card is sold with five speeds DTR rates they are class 2, class 4, class 6, class 8, class 10. These are the basic transfer rates either 2MB, 4MB, 6MB 8MB or 10MB per second. This is a minimum transfer rate, what if we want to know the maximum rate how do we find that answer. You will need a card reader (cheap) and do your personal test.