I think you are mis-understanding the difference between 'SD' and 'SDHC'. It's not a speed designation, it's a capacity designation.
The original 'SD' cards had a limit of up to 2 GB capacity. This was due to the fact that they used the FAT16 file system.
'SDHC' cards are newer cards with capacities from 2 GB to 32 GB. This is because they use the higher capacity FAT32 file system.
An even newer designation 'SDXC' is being introduced for cards from over 32 GB and up to 2 TB. These new cards will be using the exFAT file system.
The original 'SD' cards had a limit of up to 2 GB capacity. This was due to the fact that they used the FAT16 file system.
'SDHC' cards are newer cards with capacities from 2 GB to 32 GB. This is because they use the higher capacity FAT32 file system.
An even newer designation 'SDXC' is being introduced for cards from over 32 GB and up to 2 TB. These new cards will be using the exFAT file system.
https://amzn.to/3fngfo3
http://www.sdcard.org/developers/tech/sdhc/
Speed on the other hand is designated by using a 'Class' designation. The higher the class number the higher the theoretical speed. For instance a class 6 card is theoretically faster than a class 4 card. I say theoretical because it has been proven through testing that there is no consistency or standards by which these classes are determined. Class speeds have been shown to vary between manufacturers and even between different batches from the same manufacturer.
http://www.sdcard.org/developers/tech/speed_class
http://www.sdcard.org/developers/tech/sdhc/
Speed on the other hand is designated by using a 'Class' designation. The higher the class number the higher the theoretical speed. For instance a class 6 card is theoretically faster than a class 4 card. I say theoretical because it has been proven through testing that there is no consistency or standards by which these classes are determined. Class speeds have been shown to vary between manufacturers and even between different batches from the same manufacturer.
http://www.sdcard.org/developers/tech/speed_class
No comments:
Post a Comment