Sandisk Micro SDHC 16GB Class 4

Memory Cards SD | microSD | CFast |CFexpress | CompactFlash
1

Hi all,

So I just bought this card and test the speed from the phone. 

It says: 4.7 MB/s writing speed and 20 MB/s reading speed. Is this good enough for class 4, cause I see many Sandisk class 2 writing speed can reach up to 6-7 MB/s. Thanks in advance :smiley:

2

Anyone?

3

A phone is not a good receptacle to test a card’s writing speed in, so you will always get lower numbers than if you test it in an SDHC-compliant card reader.

4

@steve19800 wrote:

Hi all,

 

So I just bought this card and test the speed from the phone. 

It says: 4.7 MB/s writing speed and 20 MB/s reading speed. Is this good enough for class 4, cause I see many Sandisk class 2 writing speed can reach up to 6-7 MB/s. Thanks in advance :smiley:

 

 

anything over 4MB/s is a class 4 card. your card has a write speed of 4.7 and read much higher so to directly answer your question Yes, this is good enough for class 4

5

My Sandisk 16GB micro SDHC class 4 card also usually gives write speeds between 4 and 5 MB/s. An 8GB class 4 microSDHC I have of a different brand often gives write speeds over 8MB/s. Are the class 4 and class 10 made in the same batch, with those tesing high enough being put in the class 10 bin and the others in a class 4 or class 6 bin, or are the faster cards actually made differently?

I am still wondering about data integrity differences between full sized SDHC cards and microSDHC cards. Do you know where I can find some data about this? My gut feeling is that the full sized cards should probably be more reliable. If they are, then the question is how large is the difference? Is there any correlation between card speed and data integrity?