This post is a continuation of the 1st post Here
If you are serious to understand further details, here it is…
An SD card (which looks like a piece of plastic) is a solid-state device (without any moving parts) which has circuitries that includes flash memory and controls which regulate the flow of electrical signals (data) while writing, reading or erasing.
The very next important parameter which determines quality/cost factor is the ‘Write Speed’.
What is the importance of Write/Read Speed?
In simple words:
Writing: As an example, a 1-second video is made up of 30 still photos (or 30 frames of photos - this can be 24 or 60 or more); that is for 1 minute of video, we need to write/store 1800 frames into the memory card - got it? Always writing takes more time & is more complex, technically too.
Reading: The written data is to be ‘fetched’/selected only while reading (technically also simpler) - with your common sense, now imagine our writing & reading speed difference. (technically, both are more complex).
What happens if the Write Speed of the card is slow?
A slow speed card, instead of writing 30 frames (in a sec), it will write only, say 29 or 28 or fewer frames, which when read (played back), the quality will be poor - or frames will be dropped.
To conclude:
There are many more points: Example: If 4K is recorded at 60 fps (fps = frames per second; writing 60 photos per second, instead of 30 fps), quite naturally double the size of storage will be needed & higher speed also will be needed - hope you can imagine this.
If you have any questions or want to know more, kindly discuss in the repose session; I shall try to assist you.
Tech-Notes:
- SD card stores data on a chain of electronic units (components) known as NAND chips.
- Manufacturers are marketing different ratings with their own Suffix & Prefix: Ex: Sandisk Extreme PRO.
If you need, we can discuss… further?
Do you really need to record in 4K Or FHD (Full High Definition) is OK? & Why?
Thanks
