Database Users

SDHC 16gb

Hello, i am seeing a SD card to buy for my HTC TP, and by what i read here, they speak about class 5, class 4.... about classes...
And by what i saw on ebay, they speak it too, clan anybody explain for me what is it?
is it related with quality?
thanks

AFAIK there's only the following three classes: 2, 4 and 6.
They rate the read/write speed for that specific card.
"Class 2" means 2MBps minimum sustained write speed, and "Class 4" means 4MBps, and 6 for Class 6...
It's a different naming than "100x speed" but it classifies the cards speed in almost the same way... 'Almost' because the 100x speed indication mentions the top burst peaks, as opposed to the minimum sustained speeds...
Usually a Class 6 compares very well in terms of speed to a Sandisk Extreme IV (which is 133x speed)...
Also interesting to know: SDHC cards support FAT32, apart from more storagespace...
By the way and off the record: Google and Wikipedia seem vintage tools these days....took me more time to dig up from my own skull than looking it up...

Moaske said:
AFAIK there's only the following three classes: 2, 4 and 6.
They rate the read/write speed for that specific card.
"Class 2" means 2MBps minimum sustained write speed, and "Class 4" means 4MBps, and 6 for Class 6...
It's a different naming than "100x speed" but it classifies the cards speed in almost the same way... 'Almost' because the 100x speed indication mentions the top burst peaks, as opposed to the minimum sustained speeds...
Usually a Class 6 compares very well in terms of speed to a Sandisk Extreme IV (which is 133x speed)...
Also interesting to know: SDHC cards support FAT32, apart from more storagespace...
By the way and off the record: Google and Wikipedia seem vintage tools these days....took me more time to dig up from my own skull than looking it up...
Click to expand...
Click to collapse
so, the best is class 6, no?

'fastest' is class 6, but atm, i believe there is only class 2 16gb sdhc, which is what i've got since mid december last year.

wanwarlock said:
'fastest' is class 6, but atm, i believe there is only class 2 16gb sdhc, which is what i've got since mid december last year.
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Class 4 16gb just came out http://www.symbian-guru.com/welcome...ssy-with-16gb-mobile-ultra-microsd-cards.html but its $119.99 My class 2 16gb from sandisk was $50.

not worth it yet... will wait a while to upgrade, but i think the speed would not be that much different

Inside your device, there's not much difference between different classes. Listening to music or watching videos doesn't really require all that much speed. But if you connect to your PC to transfer files a lot, then class 4 or 6 should be noticably faster.

Here is kingston 16GB for $38 http://www.buy.com/retail/product.asp?sku=210733297

off to hong kong next week
so hoping to get a cheap SDHC 16gb class 6 for my nikon D90

pkshr said:
Here is kingston 16GB for $38 http://www.buy.com/retail/product.asp?sku=210733297
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Click to collapse
shame they don't ship to new zealand...

Class 4 SD good enough?

Currently I'm running a 16gb class 2 that I've had since the 16gb's have been out.(used in my Nokia N800) I found a 16GB class 4 on sale in town for $69 where a class 6 is $120. My question since it hasn't been confirmed (or I suck at searching) does the Magic actually take advantage of the class 6 or with the class 4 be good enough? Thanks for any info on this.
Clinton

IMHO I think your better off with a 16gb class 6, as it is recommended for many hacks Android related. Also you could probably find it cheaper online unless Monet is not an issue.

Just rather buy in town, not a big online buyer. I've read that the class 6 is the only way to go for apps 2 SD and the like but I just wanted to have faster access times to music, video and pictures really. That's pretty much all I have on the card, maybe a few docs but nothing I need to access quickly. If the music/video player or Quick office wont see/use the extra speed increase I'd rather save the cash for a nice set of headphones or case etc..
Clinton

Well the classes indicate how fast the SD card is. Class 2 = 2 MB/s, Class 4 = 4 MB/s and so on, so you would feel a difference between the two.

Cheesebaron said:
Well the classes indicate how fast the SD card is. Class 2 = 2 MB/s, Class 4 = 4 MB/s and so on, so you would feel a difference between the two.
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Very useful. I know the difference between card speeds, what I was asking is if the Magic can take advantage of the speed increase or is there a limit? I know in using my Nokia N800 (Linux OS) even the moded kernel only took advantage of the class 4 cards and there was no benefit to the class 6.
Clinton

The SD Speed Class Ratings specify the following minimum write speeds based on "the best fragmented state where no memory unit is occupied":
Class 2: 2 MB/s
Class 4: 4 MB/s
Class 6: 6 MB/s
The Class system is a minimum speed that it should perform at, if you are lucky it will work closer to the next class speed, as most cards actually perform faster then their class.
I have an 6GB class 4 sdhc card and the transfer speed is generally around 9-11 mb/s.
If you are putting a swap file on to your sdhc, a class 4 should be a minimum class you are to look for.
Personally, I use Crystal DiskMark to test the write-transfer-speed of my cards. http://crystalmark.info/software/CrystalDiskMark/index-e.html

id242 said:
The SD Speed Class Ratings specify the following minimum write speeds based on "the best fragmented state where no memory unit is occupied":
Class 2: 2 MB/s
Class 4: 4 MB/s
Class 6: 6 MB/s
The Class system is a minimum speed that it should perform at, if you are lucky it will work closer to the next class speed, as most cards actually perform faster then their class.
I have an 6GB class 4 sdhc card and the transfer speed is generally around 9-11 mb/s.
If you are putting a swap file on to your sdhc, a class 4 should be a minimum class you are to look for.
Personally, I use Crystal DiskMark to test the write-transfer-speed of my cards. http://crystalmark.info/software/CrystalDiskMark/index-e.html
Click to expand...
Click to collapse
Thanks I know the speed rating and how they are tested.
I'm not going to be putting a swap on the card or doing apps2sd, it's a Rogers Magic doesn't need either.
Thanks for the link to the speed test, didn't have one.
Does your class4 card give you any troubles at all or have you found it to be up to pare in all your storage needs? Thanks for the reply.
Clinton

Clinton, I mostly use the spare ion for simple photo taking, jotting-down notes and listening to podcasts (via meridian)/streaming radio (via stream furious) in my car. I haven't ever had any problems with it's speed.
I've had the stock 2gb in it for about 2 weeks, then a kingston 6GB class 4 in it for about a month and just this afternoon, picked up a polaroid 8gb class 6 (for $17.99 from Fry's Electronics - in-store).
the only time I have really had any problems with the speed of microsd card was when using them on my DS through r4 or supercard flashcarts. but that was back when 2gb microsd was just hitting the market (that 2gb kingston microsd from verizon was $99. in the USA, verizon was the first to publically sell this size card)
I generally try to stay away from class 2 cards just as one would try to stay away from USB 1.x devices.
without installing any additional software, a quick and simple test to check if the card is quick enough for heavy usage on your phone, might be to test if Vista/Win7 will accept it as ReadyBoost Compatible.

[Q] Micro Sd class 10 or class 6?

I'm looking to buy a new MicroSD and wondering if getting a class 10 over a class 6 would make a significant difference to the phone (if im using data2sd and or apps2sd)
Thank you!

I think the difference between class 6 and 10 would feel minor, where-as the difference between the class 2 and class 6 feels huge.
And since this is the Vibrant forums, I should mention that the internal memory in the phone is very fast. I tested it at over 10MB/s write on my first phone. My second phone its closer to 6 MB/s write. So you apps and stuff should run perfectly fine from the internal app storage.
I should also mention that I purchased the new kingston micro sd thats rated class 4 but claims speeds upto class 10. Upon testing that I got 9 MB/s write. ($28 after $10 reward from buy.com). My previous class 2 16GB card tested it 2.6 MB/s write for comparison.

Shane_pcs said:
I think the difference between class 6 and 10 would feel minor, where-as the difference between the class 2 and class 6 feels huge.
And since this is the Vibrant forums, I should mention that the internal memory in the phone is very fast. I tested it at over 10MB/s write on my first phone. My second phone its closer to 6 MB/s write. So you apps and stuff should run perfectly fine from the internal app storage.
I should also mention that I purchased the new kingston micro sd thats rated class 4 but claims speeds upto class 10. Upon testing that I got 9 MB/s write. ($28 after $10 reward from buy.com). My previous class 2 16GB card tested it 2.6 MB/s write for comparison.
Click to expand...
Click to collapse
Just to help out here...
the difference between class 2 and class 6 is the exact same as class 6 and class 10. Remember the cd-rom speeds (52x, etc)? That's how the speed is calculated for a SDHC card. So a class 2 = 2x cdrom, class 6 = 6x, class 10 = 10x.
whether our hardware has capability to handle what a class 10 can do, that I don't know. I'd definitely advise to get something with more space than a 2GB card though - I'm not sure everyone needs a 32 (personal opinion/long discussion), but I absolutely agree it should be improved upon.

designerfx said:
Just to help out here...
the difference between class 2 and class 6 is the exact same as class 6 and class 10. Remember the cd-rom speeds (52x, etc)? That's how the speed is calculated for a SDHC card. So a class 2 = 2x cdrom, class 6 = 6x, class 10 = 10x.
whether our hardware has capability to handle what a class 10 can do, that I don't know. I'd definitely advise to get something with more space than a 2GB card though - I'm not sure everyone needs a 32 (personal opinion/long discussion), but I absolutely agree it should be improved upon.
Click to expand...
Click to collapse
I understand that, thats why i picked those classes. But my point is that a class 6 card is 3x the speed of a class2 where class 10 isnt even twice as fast as the class 6. So the perceived difference is smaller, even though the technical difference is the same.

I'm still running a class 2 and I've been wondering if this is holding me back on this phone (card was previously in my G1).
Will the lower classes function the same (creating ext2 etc...) it's just a matter of speed? Just wondering if there's anything that simply can't be done with a class2 or even 6 that could be done with a 10.

CapitalM3 said:
I'm still running a class 2 and I've been wondering if this is holding me back on this phone (card was previously in my G1).
Will the lower classes function the same (creating ext2 etc...) it's just a matter of speed? Just wondering if there's anything that simply can't be done with a class2 or even 6 that could be done with a 10.
Click to expand...
Click to collapse
Just cost you more. Do you really need a class 10 for this phone? Avatar is on a card that isnt even a class 2.

Vegastouch said:
Just cost you more. Do you really need a class 10 for this phone? Avatar is on a card that isnt even a class 2.
Click to expand...
Click to collapse
xD What class was the stock sd card?

I only ever see class 6+ cards being used in higher end compact cameras and SLRs.
Putting anything higher than class 6 in a phone your using for apps/music/movies isn't needed and just a waste of money.
I've also seen a lot of people saying the memory card speeds with the galaxy s are bottlenecked right now, so your not even going to get top speeds with a class 6.

Vegastouch said:
Just cost you more. Do you really need a class 10 for this phone? Avatar is on a card that isnt even a class 2.
Click to expand...
Click to collapse
While the card isn't marked, it tests out at just over 4MB/s which would put it in a class 4.
And we should be clear that the class refers to the write speed. A class 2 will read at 10 MB/s just like the other classes. Where you run into issues with class 2 cards is when you start modding or running programs from the sd card. If you use the card for a swap partition or something the write speed now plays a major factor in the usefulness.
If all you want it for is to place your music files on there and listen to them, then a class 2 will be plenty. That was my initial thought when I bought my 1st 16 GB card for my mytouch3g. Then I got into custom roms and found myself limited.

How do you test the speed of the SD card?

What size microsd card are you looking for? If its a 32GB, I have only seen a Sandisk microsd in Class 2. As far as I know there are no higher classes at this time. Hopefully that will change soon. I would like to get all of my music onto one 32gb card.

designerfx said:
Just to help out here...
the difference between class 2 and class 6 is the exact same as class 6 and class 10. Remember the cd-rom speeds (52x, etc)? That's how the speed is calculated for a SDHC card. So a class 2 = 2x cdrom, class 6 = 6x, class 10 = 10x.
whether our hardware has capability to handle what a class 10 can do, that I don't know. I'd definitely advise to get something with more space than a 2GB card though - I'm not sure everyone needs a 32 (personal opinion/long discussion), but I absolutely agree it should be improved upon.
Click to expand...
Click to collapse
This isnt exactly true. with cdroms the X stands for how much faster it would spin in relation to a audio cd. So 1x ment it spun at the same speed as a audio cd. 2x was twice, ext ext. And this was a max speed.
Classes for SDCard stands for the minimum transfer speed. class two is at least 2mbps, class 6 is 6mbps, and so on.

frankencat said:
How do you test the speed of the SD card?
Click to expand...
Click to collapse
google FDbench
it will test the read and write speed as well as operations per second.

I still can't find a 32gb microsd class 10, anyone find one for sale?

Class 10
Class 10 limitation presently is 8 gig for all brands except the Kingston and soon to be released Silicon Power. The Kingston brand never benches as advertised, so they are not reliable from my point of view. Silicon power has been pretty solid on their claims from my testing versus their claims, but I have not yet got my hands on the latest class 10 16 gig, I have been trying to buy for the since 10-1-2010 but not out in USA yet.
Kingston (in my opinion) is rife with false claims and I find their products have always been sub par.
Flashing and alike works better with class 6 over class 2 & 4. So, if you really want more memory the only 32 gig class 6 I have seen advertised (amazon) are: Transcend, Centon, and Komputerbay (what a name?!) 32 gig Class 6
Other than that, we wil just have to wait until they get the algorithm figured out for a micro ad card with that much ram and that fast.

Get the app "sd card speed test" it works ok Im sure there are others as well

I imagine the only reason you would need a Class 6 card or above is if you plan to take a lot of HD video. Apart from that, even a Class 2 is fast enough to keep up with the still camera, not to mention anything that just requires reads, like music or movie playback.
As for running apps off an external SD card, why would you ever want to do that? You can load close to 2GB on the internal app space, which is likely way faster than any mounted external SD card. I feel like an app whore and I'm not even close to using half that space. By the time apps start getting large enough that it's an issue, we'll be on the Vibrant 2 or beyond.

glad that you asked
merrifield69 said:
I'm looking to buy a new MicroSD and wondering if getting a class 10 over a class 6 would make a significant difference to the phone (if im using data2sd and or apps2sd)
Thank you!
Click to expand...
Click to collapse
because I just picked up a 16G class 10 by WinTec last week and it is VERY fast from boot up with 9G occupied from 15G available (wondered 1G gone to? and that is a lot of gone G lol). It was $42 wo tax expensive but so far the fastest.

Whoohoo
mine 16G class 10 tested 2x >8M and 1x >9M write, 3x > 18M read and it was probably so fast that the result said "unknown class" lol. x means 1 run with 2MB buffer setting. Downloaded app call SD card speed tester.

There are now some 32GB class 6 SDCARDS on the markey, and with 2.2 and installing apps to SD that might matter. It might also matter if you have a TON of music and images, as "Scanning SD for Media" would be faster.
You will pay money for the time savings though.

Sd Card Class 10

Does anyone know the specific read and write megabytes per second limitations of our cpu's? More specifically i am wondering if we would benefit from a class 10 or if anything beyond a class 6 or are we wasting our money cuz the phone's cpu cant match the read and write speeds of a class 10. Also does anyone know how accurate sd card speed tester app is? I used it and it said with the stock class 2 sd card that it was reading 13mb per sec and writing 7mb per sec. If that is accurate then to my knowledge We would benefit from atleast a class 6 or higher.

I've looked for specs on this as well, but can't find anything, just that the max size supported is 32gb microsdhc. ;\ Would you really want to spend the money on a Class 10 card, though? $90 bucks for 16gb? No danke.

jbadboy2007 said:
Does anyone know the specific read and write megabytes per second limitations of our cpu's? More specifically i am wondering if we would benefit from a class 10 or if anything beyond a class 6 or are we wasting our money cuz the phone's cpu cant match the read and write speeds of a class 10. Also does anyone know how accurate sd card speed tester app is? I used it and it said with the stock class 2 sd card that it was reading 13mb per sec and writing 7mb per sec. If that is accurate then to my knowledge We would benefit from atleast a class 6 or higher.
Click to expand...
Click to collapse
The CPU itself would not be the limiting factor.

One tip: Sandisk's most expensive Class 10 flash is NOT the fastest for random-access reads. I've seen benchmarks done in multiple places that show that other brands (mostly sold by Newegg, nothing you can even fantasize about buying in a major retail store) are up to 50% faster.
The paradox is because "class" measures ONLY write speeds, but the way most guys here use it is as a fake hard drive in ways that are more read-intensive. Sandisk's target market isn't performance-oriented owners of high-end Android phones. Their target market is video professionals who only care about reliability and storage-life. As a result, if they have to choose between optimizing for long-term data integrity and raw blazing performance, they'll go for integrity every time as long as write performance is fast enough to meet the standard.
If you're going to walk into a store like CompUSA/TigerDirect and buy flash without reading reviews, your best bet is probably class 6. It's dirt cheap compared to class 10, and isn't much slower than average-benchmarking class 10 when it comes to reads. More to the point, it's cheap enough that if you strike out, you can chuck it and buy a more carefully-researched second card online without hating yourself for the next year. If you spend $15-20 on a mediocre class 6 4-gig card, it's not a big deal. If you spend $120+ on a mediocre class-10 16-gig card, you're basically stuck with it for the next 2 years unless you can unload it on somebody who doesn't know better.

write speeds are the more intensive and slower than read speeds. Kingston sells their products based upon write speeds. sandisk sells upon read speeds. kingston class 10 sd card equals 10 mb write speeds 19 mb read speeds sanddisk class 10 is 10 mb read and 7-8mb write speeds. it takes longer to write data and takes more cpu use. the write speeds are your priority.

Class 10
I have a class 10 Sandisk and it sucks in the nexus one
for some reason if I use the card in a reader it perform ok (10MB WRITE) but in the phone it is painfully slow... and this is true either testing with an SD card test app or by hooking thru the usb cable, so something is wrong and I am not sure it's 100% the card since it perform ok in a card reader...
Doing the same with a class 2 card is transparent, same performance from any interface (USB, Internal).
I have made some test with cluster size if 4K, 16K, 32K and it's the same... The only difference is the card themself, I know they use a new SDHC 3.0 standard, maybe this is the reson why they under perform in the nexus...

jbadboy2007 said:
write speeds are the more intensive and slower than read speeds. Kingston sells their products based upon write speeds. sandisk sells upon read speeds. kingston class 10 sd card equals 10 mb write speeds 19 mb read speeds sanddisk class 10 is 10 mb read and 7-8mb write speeds. it takes longer to write data and takes more cpu use. the write speeds are your priority.
Click to expand...
Click to collapse
You are right in regard to write being more intensive than read, especially for MLC flash but AFAIK Class are part of the SD Card standard and are based on WRITE Speed, can you point out where you take this "difference" between 2 major brand, I am not a sandisk fanboy (far from it) but I doubt this is based on anything real...

actually i read in wikipedia that sandisk sells thier products by read speed and kingston sells thier products by write speed.

It's been awhile since I looked at the spec, but the class is the minimum write speed to earn that spec. Most cards seem to exceed this. The only real way to find out real speeds is via independent tests.
Sent from my SPH-D700 using Tapatalk

Are the only 32 gb cards available Class 2? I haven't found anything faster.....

SD Card Class 2 - 4 - 6 - Make a difference?

Ok I know everyone has stated that the higher the class, the better the performance of Android on the HD2. Because as of now NAND has not been officially been completed, my understanding is the fact that a Class 6 sd card would be next closest thing.
I have a Samsung vibrant as well & there are virtually zero lags in games & applications. Yes I know Im comparing a Nand system to an SD card system, but hear me out.
On the current HD2/Android Build im running (Desire Sense Blue Topia) I've noticed while playing angry birds, there is some screen lag. I've also noticed this in the app drawer.
Now I know that NAND would help with performance and battery life, but I just wanna find out...
Is there anyone that was running a class 2 sd card, then upgraded to a class 6? And did you actually notice any differences?
Faster booting, less lag on apps, overall smoothness? Or is this just an old wives tale?
Thanks.

Class make no sense but read and write speed do.

I switched from Class 4 to 6, not much differences

But theoretically Class value should make sense, because it tells about the >minimum< write speed a card has.
* Class 2: 16 Mbit/s (2 MB/s)
* Class 4: 32 Mbit/s (4 MB/s)
* Class 6: 48 Mbit/s (6 MB/s)
* Class 10: 80 Mbit/s (10 MB/s)
Olioaglio

Olioaglio said:
But theoretically Class value should make sense, because it tells about the >minimum< write speed a card has.
* Class 2: 16 Mbit/s (2 MB/s)
* Class 4: 32 Mbit/s (4 MB/s)
* Class 6: 48 Mbit/s (6 MB/s)
* Class 10: 80 Mbit/s (10 MB/s)
Olioaglio
Click to expand...
Click to collapse
Whoa class 10! I didnt even know it existed.
Heres a listing...
http://cgi.ebay.com/Kingmax-8GB-Mic...emory_Cards&hash=item19c0adc2cf#ht_3119wt_905
Thats amazing.
Anyways, Ok so tonz said he went from 4 to 6 and didnt notice a difference.
How about from 2 to 6? And were you running the same build? Same set CPU processor speed?

Olioaglio said:
But theoretically Class value should make sense, because it tells about the >minimum< write speed a card has.
* Class 2: 16 Mbit/s (2 MB/s)
* Class 4: 32 Mbit/s (4 MB/s)
* Class 6: 48 Mbit/s (6 MB/s)
* Class 10: 80 Mbit/s (10 MB/s)
Olioaglio
Click to expand...
Click to collapse
But one thing to note ... the trade off of higher speed is higher power consumption.

EyeAndroid said:
Whoa class 10! I didnt even know it existed.
Thats amazing.
Anyways, Ok so tonz said he went from 4 to 6 and didnt notice a difference.
How about from 2 to 6? And were you running the same build? Same set CPU processor speed?
Click to expand...
Click to collapse
The same question , i used class 2 , and now , need i used class 4 or 6 or 10

Well i went from class 2 to class 6 and i didnt really saw a difference. Everything was the same, same setcpu speed, same all.
I doubt it worth the upgrade.

I can remember that someone said that the internal sd card controller has a speed limit. for sure class 6 gives higher permanent trasfer speeds than class 2. I have no idea what happens if you access many small files. usually the controllers dont reach that high transfer with small blocks.

I moved from a sandisk class 2 to a trancend class 6.
Boot is faster. Other than that, there is not a huge difference (same quadrant results)

The only difference in speed is seen when there is a lot of writing and reading done. Normal operation of android wont see much difference as it all loads into ram and runs from there. Playing games, etc won't see a noticeable speed boost with different class cards or even nand. Once the app is loaded, it's running from ram. Nand and higher class cards will help to boot quicker and with certain operations that require a lot of reading and writing to the os data file... I don't think most will notice any difference in speed.
Sent from my HTC HD2 using XDA App

Yeah, I borrowed my GFs class 6 4GB and tried it for a day.
No difference for me whatsoever.
If anything, I would say the class 2 gave me better stability.
(Had some force closes and shuch with the class6 ).
My .02

bouaroudj said:
I moved from a sandisk class 2 to a trancend class 6.
Boot is faster. Other than that, there is not a huge difference (same quadrant results)
Click to expand...
Click to collapse
That's exactly what I did. Unfortunately Transcend class 6 is slower...
EDIT: I was mistaken, 8Gb Sandisk was alsdo Class 6. See other post to see some testresults

don't know about you guys but changing the class from 2 to class 4 brought back SOD bad...extremely bad

kingston class 10 hdsd micro sd card
well as far as testing my class 2 16 gb sandisk hdsd micro sd card to my kingston card stated in the title i can say there is a very big differnce to me speed wise everything seems to transfer faster load faster and as far as videos and music i keep stored on there i must say comparing the two the class 10 is by far the best thats just my 2 cents

the access time make difference. the speed not .

Hello Everybody, I just want to share my experience regarding the micro sd card. Since i got my my TMOUS HD2, it came with the stock sandisk 16gb class 2 card. i have been using it since the day hd2 came out (late March 2010), i was using it mainly for my Android, but the card just not running stable, i keep getting SOD's on different android builds, lags and slow reading of the card. Well 2 weeks ago i decided to replace my Micro SD car to 16gb Class 10. I saw a HUGE improvement, the Android boots super fast, also not experiencing any lags nor SOD's. so my conclusion is the higher class of the card makes a HUGE difference, it makes your ANDROID runs smoother and stable on your HD2. I am very Happy
As you all notice i don't have many post here, but i just want to share my experience, Thanks to all the people who are involved in making our HD2 a one amazing phone, more power.

I don't think it'll make a difference from the speed of the card I believe its the allocation size of each card. I tried it on a 32kb allocation when formatting and it ran well. Right now I'm on 64 and seen slight improvements but the builds are still unstable or the same. Just slightly better performance. I used a class 10 card and it was okay but my experience has no credibility because I just jumped to a hd2 from a Nexus. Stupid I know but the screen trade off make its worth it because I do alot of reading and video watching. But we'll see how my expirements go.

I went from a class 2 to a class 10 and I didn't notice and difference

I went from a Sandisk Class 2 16gb to a Samsung Class 6 8gb and there was a noticeable difference.