There are four speed classes 2,4,6 and 10, representing the minimum sustained write speed in MB per second (MB/s). It determines the minimum write speed of a card and is an important factor. The speed class specification is represented by a number inside the letter 'C'. SDXC (Secure Digital Extended Capacity) cards can store up to 2000GB of data.Īlways check the supported card size for your device, as most devices support a maximum card capacity of 32GB.SDHC (Secure Digital High Capacity) cards can store up to 32GB of data.SD (Secure Digital) cards are limited to 2GB of storage.The file format used determines the cards data storage capacity. Here's a rough example of the recording times by space. It's also important to know size doesn't matter, large storage space doesn't mean the card is better, and Olympus recorders use a special format dedicated to recording professional dictation DSS/DSS Pro, which can give you a whopping 334 hours of recording time with just 2GB of space. The larger the number the more storage space the card has, but you should always check the maximum supported SD card for your device before purchase. Storage Capacity is represented in gigabytes (GB).
