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Tourist
Posts: 6

XC I vs XC II and UHS-I vs UHS-II?

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Hello, I have another question regarding the SD cards. What are the differences between XC I and XC II specifications and between UHS-I and UHS-II, and which ones for Hero8 Black? Especially which one for writing at 100Mo/s?

Thabks for your help?


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Hiker
Posts: 323

Re: XC I vs XC II and UHS-I vs UHS-II?

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sorry, speed given on cards tend to be the MAXIMUM READ SPEED and not the consistent write speed, which is slower. Even cards that give a write speed that look fast enough might not be because that speed cannot be achieved consistently.

the V numbers were started to show cards that are suitable for video recording getting a certain minimum sustainable write speed - V30 30mB/s, V60 60 MB/s or V90 for 90MB/s.

Those are megabytes per second so the Heo 8s nitrate of 100mb/s needs to be divided by 8 to get the byte rate which is 12.5 megabytes per second- so a V30 card should easily sustain those speeds.

View solution in original post


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Hiker
Posts: 323

Re: XC I vs XC II and UHS-I vs UHS-II?

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its 100mb/s I.e. megabits rather than megabites - I use 128gb v30 cards
Tourist
Posts: 6

Re: XC I vs XC II and UHS-I vs UHS-II?

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Thanks for your answer, however I al not sure I got it. Do you mean that the XC I and UHS-I refer to 100 Mb/s in writing and the XC II and UHD-II to 90 Mb/s?
Thanks again!
Hiker
Posts: 323

Re: XC I vs XC II and UHS-I vs UHS-II?

[ New ]
sorry, speed given on cards tend to be the MAXIMUM READ SPEED and not the consistent write speed, which is slower. Even cards that give a write speed that look fast enough might not be because that speed cannot be achieved consistently.

the V numbers were started to show cards that are suitable for video recording getting a certain minimum sustainable write speed - V30 30mB/s, V60 60 MB/s or V90 for 90MB/s.

Those are megabytes per second so the Heo 8s nitrate of 100mb/s needs to be divided by 8 to get the byte rate which is 12.5 megabytes per second- so a V30 card should easily sustain those speeds.
Nomad
Posts: 210

Re: XC I vs XC II and UHS-I vs UHS-II?

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Extreme Pro 128GB

 

extreme pro 128.JPG

 

Extreme Pro 64GB

 

extreme pro 64.JPG

Tourist
Posts: 6

Re: XC I vs XC II and UHS-I vs UHS-II?

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Thanks to both of you for your explanations. Indeed, I missed the division by 8. Now I fully understand why the V30 is optimal. The XC I is announced for 90 in writing and the XC II for 100, but much more expensive. Thanks to your explanations, I will stay with the XC I.

Have a nice day!