In the way video bitrates and memory card write speeds are communicated, there is a slight disparity that can cause a lot of confusion. When it comes to video, bitrates are measured in Mbps (megabits per second), whereas write speeds on memory cards are measured in MB/s (megabytes per second). What kind of difference do a few letters in the capitalization make? Megabits (Mb) versus megabytes (MB)– what sort of difference do a few letters in the capitalization make? Actually, there is a significant difference.
1 Megabyte is equal to 8 Megabits.
In memory card terms, this means that say a maximum bandwidth of 100Mbps is actually 12.5MB/s (100/8 = 12.5), rather than the advertised 100Mbps. In case it was unclear before that a U3 card's 30MB/s (megabyte) minimum write speed was insufficient, the reality is that 50MB/s (400 Mbps) is more than sufficient for any Ultra HD recording unit. That is nearly 5x the transfer speeds of standard SDHC cards, when used with UHS-I compatible devices. The performance is easy enough to test as there is any software available that can measure sustained bandwidth, we'll simply grab a USB 3.2 port with a USB 3.2 card reader attached to it, which will show maximum throughput combined with the right software stress tests.