[q] sd card class - Optimus One, P500, V General

i have 2 gb sd card that came along with the phone. i presume its a class 2 card. however i get write speed of 9.6 mbps and a read speed of 12 mbps...what should b the class of this one...what i saw on the internet is that class 2 , 4 and 6 have write speed od 2,4 and 6 mbps respectively...is that correct??

akki1791 said:
i have 2 gb sd card that came along with the phone. i presume its a class 2 card. however i get write speed of 9.6 mbps and a read speed of 12 mbps...what should b the class of this one...what i saw on the internet is that class 2 , 4 and 6 have write speed od 2,4 and 6 mbps respectively...is that correct??
Click to expand...
Click to collapse
why do you need this? if you have unmount issues, just buy a new one.. i bought a really cheap 8GB one in Indonesia (pure win for 10 USD) and it works perfectly (except i have organization issues now)

Class rating is just the minimum spec. Consider yourself very lucky to have one that exceeds the spec so much.

wally509 said:
Class rating is just the minimum spec. Consider yourself very lucky to have one that exceeds the spec so much.
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i just needed to know as a few roms need higher class sd to flash them...so i asked..?? if u could tell...

akki1791 said:
i just needed to know as a few roms need higher class sd to flash them...so i asked..?? if u could tell...
Click to expand...
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Pardon me, but I don't understand. Is this a question or a comment?
By the way, capitalization makes a difference.
9Mbps would be slower than class 2.
9MBps would be faster than class 6.

Related

Which SD card?

So i'm looking for a new Class 6 8gb SD card to replace my sandisk class 2 8gb sd.
In your opinion, what brand is best to go to, Transcend or Sandisk?
or any other brand, I would like to see options. What brand runs best with apps2sd and linux-swap? I'm currently using enomther's AOSP extpansion pack rom, but i'm thinking about moving to a HTC Hero rom, thus why I need a class 6 sdcard.
Does it really increase the overall speed of a rom?
So, in your honest opinion, which brand should I go to? Links will be appreciated, and I like amazon =D
Sandisk or A-data sd cards are the best.
Class 6 is hellofalot faster then class 2, i only have a class for now since i lost my 8gb.But you should get either one of those maybe transend if its cheaper.
I like my Transcend 8gb Class 6....just wish I could find a 8GB Class 8 or 16GB Class 10.
This is my SD card and it runs lightning fast.
.
blackknightavalon said:
This is my SD card and it runs lightning fast.
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Click to collapse
I'm definitely going to give this a try, thanks for the help
jaboswell said:
I like my Transcend 8gb Class 6....just wish I could find a 8GB Class 8 or 16GB Class 10.
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Click to collapse
Don't worry phones typically downclock the reader slot to keep battery consumption at a minimum. If you ask anyone to compare a 8gig class 6 vs a 16gig class 6 they will tell you the 8 gig is much faster then the 16. It's because the bigger card needs more voltage to get to the same speed as the 8 gig card due to it's more condensed package. Also this is to allow for less heat issues cause of course more voltage to the card slot means more heat.
psychoace said:
Don't worry phones typically downclock the reader slot to keep battery consumption at a minimum. If you ask anyone to compare a 8gig class 6 vs a 16gig class 6 they will tell you the 8 gig is much faster then the 16. It's because the bigger card needs more voltage to get to the same speed as the 8 gig card due to it's more condensed package. Also this is to allow for less heat issues cause of course more voltage to the card slot means more heat.
Click to expand...
Click to collapse
so does that mean (in theory) that a 32gb would be super dooper slow? For linux-swap and such?
I'e never had any problems with transcend. I got my 8GB class 6 from Amazon for £14

Post your SD TOOL speeds

Hey guys , this is not a e-peen enlarging competition but rather a way to know the best overall SD cards on the market . I for example want to change my lying of a SD card , that even though says it's class 6 it definetely ain't
And for others.... it can be a e-peen competition if you want .
Don't forget to add name , class and write Speeds , a screenshot would be worth a thousand words but for the lazy ones , simply writing your speeds here will be fine too .
Cheers and take a look at the app https://market.android.com/details?id=ales.veluscek.sdtools&feature=search_result
D Tools - Info and Benchmark tools.
With SD Tools you can check your microSD card information (Name, Date, MID, OEMID,...). You can check if your card is fake. (Check serial number and MID and OEMID).
You can also benchmark sd card writing and reading speeds.
You can also submit results and information to internet. In future there will be results. (As soon I got enough results).
Please write to me sreenshot if there are some problems.
Does not shows Card Info On Galaxy S, but you can check speed of external sd Card.
Please write to me, if you got suggestions, or problem report. I can not reply you to comment. And I can't fix problems if I got no feedback. If SD Tools can not test external card, please let me know. (I know for Samsung Galaxy S)
Known bugs: Read speeds are sometimes incorrect (High values). This happened after reset.
Click to expand...
Click to collapse
My speeds .
SD : Teamgroup
Class : 6
Writing speed : 5 mb/s ( a far cry to the minimum 6 mb/s that it should be )
Read speed : 30mb/s ( mediocre once again I know )
Manufacturer: some dude on some ship
Model: SA08G
Class: unspecified, but I'd say "4"
Writing speed: 3,9 MB/s
Reading speed: 14,7 MB/s
Testing it on a computer yielded higher values though (4,2 & ~18 MB/s). Also, for daily use it proves to be OK.
Fujitsu (SU08G)
class 4
ran it three times
avg scores:
write: 4.2
read: 35.9666667
Trials:
trial1:
w: 3.6
r: 35.5
trial2:
w: 4.3
r: 35.7
trial3:
w:4.7
r: 36.7
using mik_os's CM7 beta3
I posted a thread related to this (and low I/O scores) before. Here are my speeds:
View attachment 547797
I have a Class 4 Sandisk 8 GB. I guess i got more than what i paid for.
BTW, what are memory prices down there where you live? I got the 8 GB class 4 Sandisk for INR 640 = 14 USD.
Something's not quite right...
Considering the fact that this comes from a Shanzai-ish company I bought the card from xD
kpbotbot said:
Something's not quite right...
Considering the fact that this comes from a Shanzai-ish company I bought the card from xD
Click to expand...
Click to collapse
What is this world coming to...
Redid the test. Same thing
kpbotbot said:
Redid the test. Same thing
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Lol your tests aren't extraordinary at all . Everybody knows that microSD's are made by monkeys in suits and every once in a while some models are freakishly good.
If you want to be super sure just restart your phone and redo your tests but considering your reading speeds weren't flat out dumb ( 100 mb + ) where the bug usually occurs then it's ok
At my place a 8gb Sandisk class 4 is around 20-25 USD
kpbotbot said:
Redid the test. Same thing
Click to expand...
Click to collapse
How much you got it for? If its less than 14 USD then FML!
kewlsid05 said:
How much you got it for? If its less than 14 USD then FML!
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Click to collapse
12$. HAHAHAHAHAHAHAHAHA I'm not from the US and I just converted the price here to dollars. And oh, this is an 8GB card.
Lol your tests aren't extraordinary at all . Everybody knows that microSD's are made by monkeys in suits and every once in a while some models are freakishly good.
Click to expand...
Click to collapse
I know. That's why I said something's wrong. When I copy files to my SD via USB, I get 5.90MB/s, so that makes this card class 6. What boggles me is why I'm getting fast writes to the with my phone xD
And I understand my read speeds aren't that great
Model: Serioux 4 GB
Class: 6
Writing speed: 10.5 MB/s
Reading speed: 45.3 MB/s
kpbotbot said:
12$. HAHAHAHAHAHAHAHAHA I'm not from the US and I just converted the price here to dollars. And oh, this is an 8GB card.
Click to expand...
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Ya. I am not from US too. I too did the conversion from INR(Indian National Rupee)
Was just curious about the memory prices in other countries
Good for you mate. Next time i'll buy Shanzai instead of brand name product!
I suggest you don't. There's more to life than just read and write speeds. I bought this since it's extremely cheap compared to popular brands. I'm actually more concerned with flash storage life (read and write cycles are limited), but money is precious. Besides, my SD on my Symbian phone (bought almost 3 years ago) is still working perfect
Ya. I was just kidding. And anyway, 2 $ is not that big a deal.
I have always gotten sandisk/transcend flash memory since my no brand dirt cheap memory stick pro duo in my K750i went kaput.
badeaioan said:
Model: Serioux 4 GB
Class: 6
Writing speed: 10.5 MB/s
Reading speed: 45.3 MB/s
Click to expand...
Click to collapse
Hey where did youy get that from ?
Model: Sock SD 2GB
Class: Unknown
Writing speed: 5.8 MB/s
Reading speed: 35.4 MB/s
Write Speed - 9.8 MB/s
Read Speed - 16.0MB/a
16GB A-DATA Class 6 microSDHC
Wow , A-data cards have good speeds
From eMAG.ro .
Zerobarat1 said:
Hey where did youy get that from ?
Click to expand...
Click to collapse
Sent from my LG-P500 using XDA App
badeaioan said:
From eMAG.ro .
Sent from my LG-P500 using XDA App
Click to expand...
Click to collapse
Wow I think you got lucky buying a serioux and actually getting a beast of a Microsd . I think I'll try one 2 . Do you get microsd failuires or is it rock solid also?

[Question] Class 10 Speed

Hi, I've recently purchased a class 10 16 gb sdhc card for my phone on ebay. I got 15MB/s write and 15MB/s read using the SD Card Speed Test application and i got 2MB/s write and 10MB/s read using my stock Class 2 8 gb sdhc card. Now I need to leave feedback and could anyone from this forum please tell me if this is a good speed for a class 10 card or did i get ripped off?
Eryklok said:
Hi, I've recently purchased a class 10 16 gb sdhc card for my phone on ebay. I got 15MB/s write and 15MB/s read using the SD Card Speed Test application and i got 2MB/s write and 10MB/s read using my stock Class 2 8 gb sdhc card. Now I need to leave feedback and could anyone from this forum please tell me if this is a good speed for a class 10 card or did i get ripped off?
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Click to collapse
Yeah you got ripped off because class 10 should give you 30mb/s read write
/sarcasm mode
Sent from my SAMSUNG-SGH-I897 using Tapatalk
LOL
Thats the speed of Class 10 dude !
you got what you paid for
but you can get better result by modifying buffers
you mean use a script to change the reading speed? yeah i know. and thanks for the replies guys i was just making sure no need to make fun of the noob greenstuffs :/
yep, thats what i mean,
it will speed up, read and write both ways !
Your write speed is really good, got 15MB/s, too with my Kingmax 16GB c10, but only once.
To improve your read speed you should install the app "SD increase", then you should get 25-30MB/s read or even more. My Kingmax is cheap (32€) because of that I "only" get 25-30MB/s read using the SD increase app.
When I changed the cache myself I got 40MB/s read, but after a reboot the changes are gone so I prefer the SD increase app.
@ zmbutt:
I think his write speeds won't increase (much), 15MB/s are already really high and not really affected by the buffer size.
it made no change at all :/ i got mine for $35 AUD lol

[Q] SDHC class for 720p reading

I'm confused on the Class rating for SD cards. I understand it to be a write-speed rating, and in my usage I'm more concerned with read throughput. My goal is to watch 480p and 720p content without jitters, and I'm not sure if the higher class matters or not for reads.
Thanks!
The write speed is going to be the same as the read speed. With flash memory fragmentation doesn't effect read speed much because of the low access time. With writing the card has to find an empty cell and write which could effect the writing performance. The class signifies that under heavy fragmentation the card should write at the speed of the class (i.e. class 10 should be 10 Mb/s). Also, regardless of fragmentation the card should read at the speed of the class. So in your case if your not needing high speed write then a class 2 or 4 should be fine. I personally wouldn't go below 4 because you never know if you might need the extra speed later.
Looking at Wikipedia the class is both Read & Write.
I personally use class 4 16GB cards and they seem to do the job fine on the re-encoded 1080/720 content I have on them.
I have a Class 10 Patriot Micro SDHC card and it works fine. I also tested with a Patriot SDHC (full size) in the sock and works fine. Both tested with 720p H264 MOV.
Heh I would be worried if a class 10 (being the fastest you can get) was having issues
Sent from my Transformer TF101 using Tapatalk
a class 10 is perfect for anything and ull only spend another maybe 10then a class 4. i only get class 10s or higher for my phones and cameras just in case i need the extra power
Sent from my PC36100 using Tapatalk
Full size SD's are pretty similar in price between classes but microSD's are insanely different... £17 for a class4 16GB or £40 for class10
alex5790 said:
The write speed is going to be the same as the read speed. With flash memory fragmentation doesn't effect read speed much because of the low access time. With writing the card has to find an empty cell and write which could effect the writing performance. The class signifies that under heavy fragmentation the card should write at the speed of the class (i.e. class 10 should be 10 Mb/s). Also, regardless of fragmentation the card should read at the speed of the class. So in your case if your not needing high speed write then a class 2 or 4 should be fine. I personally wouldn't go below 4 because you never know if you might need the extra speed later.
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Click to collapse
No. The class is the garunteed write speed, the read speed has no relation and can vary from card to card. I am using one of two cards in my tab, one a class 4 and the other a class 2 and neither have ever come close to having an issue streaming. The class 4 can read at over 16mb/s, Ive tested it.
The only reason to pay for a C6 or higher card is because you need to push data to it quickly., like recording video.
ryan stewart said:
No. The class is the garunteed write speed, the read speed has no relation and can vary from card to card. I am using one of two cards in my tab, one a class 4 and the other a class 2 and neither have ever come close to having an issue streaming. The class 4 can read at over 16mb/s, Ive tested it.
The only reason to pay for a C6 or higher card is because you need to push data to it quickly., like recording video.
Click to expand...
Click to collapse
+1. This is the correct answer. Good cards typically read much faster than the write speed.
Read speed is not correlated to the write speed or class rating at all...and in most cases, it's way higher than the write speed...
so theoretically even a class 1 card (if you can find one) is able to stream 720P content without much issues..but it will take forever to copy the content onto the card.
my class 10 card reads over 30MB/s and my class 4 does around 16MB/s
What card do you have? I was looking into getting one.

What Class MicroSD card to go for (Gaming and lots of apps in Mind)

Hey Guys
Am looking for a suitable Microsd Class rating ( am going for Sandisk, 16 GB or 8GB) for my Motorola Photon. I am going to install a lot of games, specially those Tegra 2 ones, Max Payne and others too, and alot of apps on the phone.And i might use Link2SD to move them to the SD card to keep Phone memory less occupied.
So as to what i feel is that i'd be requiring good read/write speeds for games, plus proper loading of apps (in time, i don't want lags at all). the problem is, according to the Price, i can go for 8GB class 6 or 16GB class 4. What do u guys think i should go for? would it really matter? i know class ratings are the Writing Speeds, but who knows?
Regards
Save up for a Class 10. There is a world of difference between a class 4 and a class 10 especially when using ROMs that have the SDSpeed tweaks.
I like class 4 personally as write speed really only affects installing imho. lower write cards tend to have higher read as well. SanDisk as a brand makes Damn fine cards which I think brand makes more difference than class overall.
Sent from my mopho
@Loki,
What about a Sandisk 8 or 16GB Ultra at UHS 1 speed?
i read the following on Wikipedia about UHS Cards
"Cards that comply with UHS show UHS-I or UHS-II on the label, and report this capability to the host device. Use of UHS requires that the host device command the card to drop from 3.3-volt to 1.8-volt operation and select the 4-bit transfer mode".
Is above compliant with Motorola Photon? I cant seem to find a Sandisk card with a Class 10 rating else than this one.
@Cornelius,
i think that when playing a game, the Phone might want to Read/Write data during play times even.Reading happens all the time, but Writing would also take place. But as Loki said, i'd be interested in trying these ROMs with SDSpeed tweaks. i really want no lags at all...
Regards
it really depends on the game, but writes happen way less than reads in most cases. class 10 is more for pictures and videos in my humble opinion. most games were it matters, it's a 400+ mb 1 Time download and then massive reads.
Sent from my mopho
@Cornelius
What about apps? they would also be fine with Class 4? i use a Sandisk 16GB class 4 in my Sansa Fuze all the time, and never had a problem with it, but i dont want my phone to lag at all. Apps might need to Read and Write in real time right??
Regards
if finances are an issue, than here is a G Skill brand 32gb class 6 for $15 shipped.
http://www.newegg.com/Product/Produ...ction-_-cables-_-na-_-na&Item=N82E16820231603
usually in 99.99% of cases read is more important than write. usually writes are so small they don't matter.
Sent from my mopho
Lexar 32GB Class 10 $26
I'm averaging 11MB Write and 21MB Read on Imperium Initiatve
high write or high read its always a compromise. if your that worried about hints of lag use the smallest sdcard you can get by with.
Sent from my mopho
@Lokifish Marz
One suggestion was Class 10 microSD, and when paired up with ROMs that have SDSpeed tweaks, where does the difference lie (imagining u have experiences with class 10 and SDSpeed tweaks)? What is better than when a class 4 is used?
Plus what tool do u use to get the Read/Write speeds? i suppose its on ur phone only? Also i am thinking of pulling the trigger on an 8GB Class 10 Sandisk. I live in India and Amazon is not an option.....only ebay.in is....
@Cornelius, i agree with what u say about reading going on way more than writing, but then what about SSDs in computers? the performance boost is just because of the Increase in read speeds and not write? I know it gets pretty complex in computers, swap and pagefiles, etc, but faster HDDs mean faster computers, and even though writing happens lesser than reading on the phones, but some writing must be happening that bottlenecks the speed of the phone. am i Right? just trying to learn here from u guys.
Regards
no I'm saying a class 4 usually has a higher read speed than a class 10 but yes the big boost from ssd hdd is the read in 99% of cases.
Sent from my mopho
psgarcha92 said:
@Lokifish Marz
One suggestion was Class 10 microSD, and when paired up with ROMs that have SDSpeed tweaks, where does the difference lie (imagining u have experiences with class 10 and SDSpeed tweaks)? What is better than when a class 4 is used?
Plus what tool do u use to get the Read/Write speeds? i suppose its on ur phone only? Also i am thinking of pulling the trigger on an 8GB Class 10 Sandisk. I live in India and Amazon is not an option.....only ebay.in is....
@Cornelius, i agree with what u say about reading going on way more than writing, but then what about SSDs in computers? the performance boost is just because of the Increase in read speeds and not write? I know it gets pretty complex in computers, swap and pagefiles, etc, but faster HDDs mean faster computers, and even though writing happens lesser than reading on the phones, but some writing must be happening that bottlenecks the speed of the phone. am i Right? just trying to learn here from u guys.
Regards
Click to expand...
Click to collapse
I am not sure what class 4 Cornelius is using. I don't have one but do have a class 6 Lexar from the same family as my class 10. On Imperium, the class 6 was slower than the class 10 in every aspect:
Lexar 8GB
class 6
Write- 5.8MB/s
Read- 18.8MB/s
The SDpeed tweaks, when set up correctly, improve read speeds across the board. It does tend to max out at a read speed of 20-25MB/s on Imperium. Further tuning may improve this but haven't had the time. I haven't tried any of the UHS cards yet. The big drawback with lower class cards is going to be your write speeds, the falloff on write speeds is there but not as much.
I'm not saying that Cornelius is wrong, just in my personal experience with flash storage has been different. Having used flash storage as everything from regular use to building flash storage based workstations, the lower class rating has a noticeable impact on write speeds but not so noticeable impact on read speeds on a tuned setup.
I only use SanDisk cards, used to go Kingston but they kinda fell out a while back.
Sent from my mopho
I'm using the newer Samsung cards and they make quality memory as well. As cheap as a class 10 card can be had why not go for that over a lower class card?

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