alh41

What does memory card class refer to? It has been mentioned several times in memory card discussions.

Just received a now ScanDisk Ultra 8GB card as a gift and find no reference to class on packaging.

Thanks!

MT Shooter Loc: Montana

Class is a reference for speed on SDHC cards. Not on CF cards

GoofyNewfie Loc: Kansas City

Interesting question.
Here is a link about memory cards on Adorama's site:
http://www.adorama.com/alc/article/Memory-Myth-Buster

alh41

Thanks for the information. Now I are smart?

GoofyNewfie Loc: Kansas City

No, Smart Cards are no longer made. But that's a different subject.

:lol:

MT Shooter Loc: Montana

Very good article Goofy, thanks.

GoofyNewfie Loc: Kansas City

First one that popped up on Google search.

I'm going to have to look closer at Adorama's site.
Great store- lots of great info.

Maybe they'll help me find the mate to a sock I lost last week.

Gidgette Loc: Boerne,Texas

Don't count on it, the one legged man has already left the building. LOL I remember that Daddy used to tell Mom that the one legged man took it everytime a sock was lost. The socks never did show up. When I got married, I bought everyone a color for each one and they were one color. LOL

oldtool2 Loc: South Jersey

Dont you know? Washers and dryers eat them for breakfast. Those poor socks go where no sock should ever go, and never come back!

Jim D

rayford2 Loc: New Bethlehem, PA

I'm missing something here (not unusual for me).
The last sentence in #2 states the class rating pertains ONLY to 1080P HD video, not still photography.
And then #3 says speed DOES matter when using RAW format in burst mode.
Can you enlighten me on this? It seems like a contradiction.

WAL

False. SDXC is simply a measure of a card’s capacity, not its speed. Here's how the different SD capacities break down, by card type:

0 – 2 gigabytes = SD Card
2+ - 32 gigabytes = SDHC Card
32+ gigabytes = SDXC Card

What does this mean 2+ - 32 gigabytes = SDHC Card

Hammster Loc: San Diego, CA

Nope, it's at the laundromat in San Francisco. Sorry for the hijack. ;)

GoofyNewfie's sock is here.

jkm757 Loc: San Diego, Ca.

Look in the used equipment section for that sock.

OnDSnap Loc: NE New Jersey

Anything like the missing grape that falls off the counter?
ya know it's in the kitchen, but can't find it....

senad55verizon.net Loc: Milford, NJ

rayford2 is right, there's something strange about Adorama's myth buster.

First, Adorama describes speed measures which, in SDHC cards, includes Class:

"Example: SanDisk’s Extreme CompactFlash and Lexar Professional 400X cards are both 60MBS and 400X. These numbers represent the rate at which data can be transferred from/ to the card and host device (camera/ camcorder). If you know the MBS number (in this case 60MBS), you simply divide that number by .15, so in this case: 60MBS/ .15 = 400X, Conversely, if you know the “X factor, you can easily calculate the MBS: 400X x .15 = 60MBS"

"It’s a little more complicated with SDHC cards, where there are three measures of speed. Let’s take a 30MBS, 200X, Class 6 card as an example. The same relationship between MBS (megabytes per second) and the “X” factor applies to SDHC as to CompactFlash: 30MBS/ .15 = 200X

In addition to the MBS and “X” factor, SDHC cards are also designated with a Class rating (typically Class 4, 6, or 10). The Class rating system is ONLY relevant when shooting full 1080P HD video onto SDHC cards. It is not applicable to CompactFlash cards and is NOT relevant to still photography when using SDHC cards."

And then

"3. "The speed of a card is more important when shooting video than when shooting still photos."

False. When recording video, you are shooting a small, but sustained stream of data onto a card (like a garden hose). When you are shooting RAW files (still photography) at a burst rate of 5 or 6FPS, you are sending a 10- to 20 megabyte file (based on your particular camera brand and model) onto a card at 5 or 6 times per second (like aiming a fire hose at your memory card). High-resolution RAW images shot in rapid sequence are a lot more information that needs to be transferred quickly, and require a larger “hose” than videos."



Class, a speed rating for video, doesn't apply to stills. So MBS and/or "x" factor must be the relevant speed rating for stills?

Except none of my SD cards have any such designation on them. If you shop for SDHC cards online, none list MBS or x values.

Incidentally, the Wikipedia discussion of SD cards and their variants don't mention that Class ratings only apply to video, not to still photography.

Anyone really figure this out yet??