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PostPosted: Sat Apr 18, 2009 3:59 am 
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I am in the market for a new SD card, and now that I am recording some AVCHD as well my space requirments have increased. The problem is I see so such a huge range of prices for a 16 GB SDHC card it makes me wonder if they are not created equal.

Are some SD cards more reliable, faster, better than others or should I just get any brand and just shop based on price?

I also see some 32 GB SDHC cards coming out this month, but right now of cource the price on these things are silly.

Thanks for the reply.
I am looking for a 16 GB card.


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PostPosted: Sat Apr 18, 2009 10:18 am 
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Prices are mostly subject to card speed and space. A slow 8 GB card is cheaper than a fast 4 GB in general.

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PostPosted: Sat Apr 18, 2009 11:42 am 
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SHDC cards come in different classes - the higher the class the higher the minimum guaranteed write speed they should have:

* Class 2: 2 MB/s - 13x
* Class 4: 4 MB/s - 26x
* Class 6: 6 MB/s - 40x
http://en.wikipedia.org/wiki/Secure_Digital_card#SDHC

You'll most likely see class 4 cards at 16GB sizes. I have 2 transcend class 6 16GB SDHC card which cost about £25 each. I went for the class 6 because I tend to use continuous shooting and didn't want the burst speed to be hampered by slow media. I don't know if, in reality, the difference between class 4 & 6 would make a difference on my 450D but it may for you depending on your sensor/file size and whether you shoot RAW+jpeg or just jpeg.

Jamie

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PostPosted: Sun Apr 19, 2009 2:00 am 
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Some SD cards are going to be more reliable than others. Make sure you get a "name brand" SD card. SD cards have an undefined limit to how many times they can read/write before they die. Good cards will last much longer than the cheap cards.

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PostPosted: Sun Apr 19, 2009 7:36 am 
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Shagrath wrote:
Some SD cards are going to be more reliable than others. Make sure you get a "name brand" SD card. SD cards have an undefined limit to how many times they can read/write before they die. Good cards will last much longer than the cheap cards.


Do this. I've had 2 unbranded cards fail on me, and no branded ones.

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PostPosted: Sun Apr 19, 2009 9:43 am 
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Stay Away from A-data.. I've heard tons of horror stories about them. and not all class 6 sdhc cards are the same i believe, the lexar was beaten easily by the extreme 3.

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PostPosted: Sun Apr 19, 2009 2:24 pm 
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Sounds like one of those Extreme III or IV should be a good one to go with then.


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PostPosted: Sun Apr 19, 2009 5:59 pm 
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eagle1337 wrote:
not all class 6 sdhc cards are the same i believe, the lexar was beaten easily by the extreme 3.


Agreed. The class standards are minimum speeds only. Different brands will perform differently above these minimums. Also remember to reformat your cards in camera once in a while - this stops the file fragmentation affecting your read/write speed.

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PostPosted: Sat Apr 25, 2009 2:40 pm 
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Can all digitals handle larger capacity SD cards?

I was told that not all digital cameras could read the 16GB cards, some where limited to 4 or 8GB's, but I have never read such a thing.


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PostPosted: Sat Apr 25, 2009 4:15 pm 
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whiterabit1 wrote:
Can all digitals handle larger capacity SD cards?

There are essentially two types of SD card currently on the market (ignoring the physical size differences for micro SD etc). These are the standard SD card which are 2GB or less and the SDHC card capable of capacities greater than 2GB.

To be able to use SDHC cards your camera must be SDHC compatible. This is because SDHC uses the FAT32 filesystem (which your camera needs to understand) whereas the standard SD card uses FAT16. You can use standard SD cards in a camera capable of using SDHC, though.

Most modern cameras can take SDHC cards but you need to check your manual first.

Jamie

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PostPosted: Sat Apr 25, 2009 6:34 pm 
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Oh, and SDHC cards go up to 32 GB's

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PostPosted: Sun Apr 26, 2009 1:23 am 
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So an SDHC camera should be able to work with any GB size SDHC card.
Regardless if it's 4GB or 32GB correct?


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PostPosted: Sun Apr 26, 2009 2:36 am 
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whiterabit1 wrote:
So an SDHC camera should be able to work with any GB size SDHC card.
Regardless if it's 4GB or 32GB correct?

Correct.

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