Several questions come to mind caused by the profusion of cards on the market.
Brand, which is the best/has the best reputation?
What is the difference between Untra II, III, SDHC, etc. It is easy to become confused.
Personally, I have had the best luck with Sandisk Ultra II SDCH
It really depends on what you need it for. For cameras that take rapid shots, faster is better. Generally though, in most applications speed differences are not very noticable.
Some older readers and machines will not run dht SDHC (Higher than 2 GB capacity, but most newer ones will run the higher capacity.
If you rarely fill your cards, and don't "wait" for the cards to respond eg in your camera or device, then go with multiple cards rather than one large one. For example, 2 4 GB cards might give you more flexibility than one 8GB card...and will be cheaper.
Also, if you have devices that use mini or micro cards, you might gain some flexibility by having a couple with the adapters to make them into standard size SD cards.
Sandisk Ultra's are good, generally faster, but more expensive.
One thing for sure, you can't go by the package wording like
"high speed" "ultra-fast"; "double speed" etc. The only think that matters for speed is the rating.
About a year ago, I did a little research on the cards and the below is a bunch of info, that might be helpful.
Goood luck.
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Wiki posting is good:
http://en.wikipedia.org/wiki/Comparison_of_memory_cards
There are different speed grades available which are measured with the same system as CD-ROMs, in multiples of 150 kB/s (1x = 150 kB/s). Basic cards transfer data up to six times (6x) the data rate of the standard CD-ROM speed (900 kB/s vs. 150 kB/s). High-speed cards are made with higher data transfer rates like 66x (10 MB/s), and high-end cards have speeds of 200x or higher. Note that maximum read speed and maximum write speed may be different, with maximum write speed typically lower than maximum read speed. Some digital cameras require high-speed cards (write speed) to record video smoothly or capture multiple still photographs in rapid succession. Higher speeds of up to 200x are defined by specification 2.0.
The following table lists some common ratings and their respective minimum transfer rates.
Rating Speed (MB/s) SDHC Class
6x 0.9 n/a
13x 2.0 2
26x 4.0 4
32x 4.8 4
40x 6.0 6
66x 10.0 6
100x 15.0 6
133x 20.0 6
150x 22.5 6
200x 30.0 6
266x 40.0 6
300x 45.0 6
SDHC (Secure Digital High Capacity, SD 2.0) is an extension of the SD standard that appeared in June 2006.[14] SDHC allows standard-compliant capacities in excess of 4 GB. SDHC cards are often formatted with the FAT32 file system.[15] It uses the same physical and electrical form factor as SD, but the SD 2.0 standard in SDHC uses a different memory addressing method (sector addressing vs byte addressing), thus theoretically reaching a maximum capacity of up to 2 TB (2048 GB). Currently the SD Card association has artificially defined the maximum limit of SDHC capacity to 32 GB[16], however the SD card specification states that "SD Memory Cards with a capacity greater than 32 GB will be available with updated versions of [the specification]."[17] SDHC cards work only in SDHC compatible devices, but standard SD cards work in both SD and SDHC devices. The SDHC trademark is licensed to ensure compatibility.[18]
[edit] SD Speed Class Ratings
SDHC cards have SD Speed Class Ratings defined by the SD Association. The SD Speed Class Ratings specify the following minimum write speeds based on "the best fragmented state where no memory unit is occupied":[19]
• Class 2: 2 MB/s - 13x
• Class 4: 4 MB/s - 26x
• Class 6: 6 MB/s - 40x
SDHC cards will often also advertise a maximum speed (such as 133x or 150x) in addition to this minimum Speed Class Rating. See section speeds above for a further explanation. One critical difference between the Speed Class and the maximum speed ratings is the ability of the host device to query the SD card for the speed class and determine the best location to store data that meets the performance required. "Maximum speed" ratings are quoted by the manufacturers but unverified by any independent evaluation process.
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