Sorry this is a bit of a n00b question, but do SD card speeds actually effect the Transformer Prime? As in can it handle class 10, or does say class 4 already reach it's read/write limit?
The reason I'm asking is because I have a spare class 2 16GB micro SD card and want to use it for ROM storage - trying to figure out whether I need to grab a class 10 card instead or not. Cheers
The "class" is all about write speed, and specifically about "burst" write speed.
What that means is that "burst" writes happen when you write a huge amount of data in one "shot" (e.g. pics or vids).
Generally, lower class cards trade off "burst" write speed for random access speed. IOW, they have a lower "burst" write speed, but do better for random access writes.
Also generally, every card regardless of "class", will provide the same read speeds.
So, determine how you expect to use your card.
Going to write large amounts of data to it regularly? Get a class 10.
Going to write infrequently (especially small data)? Get a class 4-6.
P.S. cameras and video recorders *need* high burst write performance, and since the nature of that data is huge, small random-ish writes never happen.
curreyr said:
The "class" is all about write speed, and specifically about "burst" write speed.
What that means is that "burst" writes happen when you write a huge amount of data in one "shot" (e.g. pics or vids).
Generally, lower class cards trade off "burst" write speed for random access speed. IOW, they have a lower "burst" write speed, but do better for random access writes.
Also generally, every card regardless of "class", will provide the same read speeds.
So, determine how you expect to use your card.
Going to write large amounts of data to it regularly? Get a class 10.
Going to write infrequently (especially small data)? Get a class 4-6.
P.S. cameras and video recorders *need* high burst write performance, and since the nature of that data is huge, small random-ish writes never happen.
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Ah cool, had no idea, thanks for the explanation, appreciate your time Do you think Class 2 would be sufficient for ROM access (including N64 and possibly PSX)?
crimsonnight said:
Ah cool, had no idea, thanks for the explanation, appreciate your time Do you think Class 2 would be sufficient for ROM access (including N64 and possibly PSX)?
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Give it a shot. It'll probably be fine if all you're doing is reading the data off the card (it'll be slow writing the stuff to it initially tho).
Could also run crystalDiskMark on it via a PC and usb adapter.
Record a video in the highest quality. When you play back the video, if it does not stutter/skip, then it is fast enough for anything you will use it for.
As for whether it will be good enough for ROMs...try using it for the game Castlevania Portrait of Ruins and if the game doesn't freeze it is fast enough for any game. Most likely all ROMs will work though... Just test it and see before buying one.
Well considering you can get class 10 32gb microSDHC cards for around $30 I'd say go with the best
Sent from my Transformer Prime TF201 using xda premium
jondroot said:
Well considering you can get class 10 32gb microSDHC cards for around $30 I'd say go with the best
Sent from my Transformer Prime TF201 using xda premium
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I've seen class 4's for that, but where are you finding a class 10 32gig for $30?
Sent from my Transformer Prime TF201 using Tapatalk
class 10 is NOT best for all uses. In fact it can be 20-50 times slower than a class 4 for random access writes.
class 10 and class 4 are going to be nearly equivalent for any reading from the card (sequential and random).
crimsonnight said:
Ah cool, had no idea, thanks for the explanation, appreciate your time Do you think Class 2 would be sufficient for ROM access (including N64 and possibly PSX)?
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Yes it will be. I had a class 2 16gb card that worked great for Paxil and other weaker systems r
games. I now use the class 4 32gb card from my phone and it works the same, the 16gb card is now in my phone...lol
rand4ll said:
Yes it will be. I had a class 2 16gb card that worked great for Paxil and other weaker systems r
games. I now use the class 4 32gb card from my phone and it works the same, the 16gb card is now in my phone...lol
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Thanks, but what's Paxil?
Related
Does anyone have a Class-10 MicroSDHC card running on their Atrix? If so, how's it performing? Thanks.
Ya I want to know this too has someone tried different classes?
Sent from my Atrix 4g using XDA Premium App
i have class 4, 6, and 10 and honestly i cannot tell the difference under normal use. The only reason I got class 6 then upgraded to class 10 was for apps2sd on my nexus. I havnet done any formal tests, but from practical, every day use, no difference.
I do transfer files a lot from pc to phone so of course class 10 transfers them quicker. But normally you are not running many things off of SD, maybe music, which class 2 or 4 is good enough for.
NguyenHuu said:
i have class 4, 6, and 10 and honestly i cannot tell the difference under normal use. The only reason I got class 6 then upgraded to class 10 was for apps2sd on my nexus. I havnet done any formal tests, but from practical, every day use, no difference.
I do transfer files a lot from pc to phone so of course class 10 transfers them quicker. But normally you are not running many things off of SD, maybe music, which class 2 or 4 is good enough for.
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I am still on the good old 4 GB card I bought a couple years ago. Fares pretty good for all day-to-day activities.
I just put in a class 6 16GB and I don't notice that big of a difference. I don't think you'd really notice a difference unless you were looking hard.
The higher the class of card, the faster the read/write speeds are. Things is, you will only see these speeds if you are transferring big files. If you are just putting MP3's and small videos on the card, you won't see much of a difference. Sequential Write speeds are significantly faster than Random Write speeds, but Sequential Read speeds vs Random Read speeds, there is not much difference.
NguyenHuu said:
i have class 4, 6, and 10 and honestly i cannot tell the difference under normal use. The only reason I got class 6 then upgraded to class 10 was for apps2sd on my nexus. I havnet done any formal tests, but from practical, every day use, no difference.
I do transfer files a lot from pc to phone so of course class 10 transfers them quicker. But normally you are not running many things off of SD, maybe music, which class 2 or 4 is good enough for.
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Have you tried the Class-10 card in the Atrix? If so, which model/size is it? Thx.
Everyone: Thanks for your inputs!
Class Speed rating ONLY applies to WRITE speeds - has nothing to do with read speeds. Primarily designated for camcorders and other devices that need guaranteed minimum speed for writing data.
The camcorder on the phone doesn't require a specific card class, so spending money on higher speed cards is not a great idea. If you are copying movies from pc to sd regularly then it will save you a bit of time - that is all.
http://www.sdcard.org/developers/tech/speed_class/ and wikipedia explain SD speed pretty simply.
I ordered a 32GB Lexar Class 10 microSDHC. Should be getting it today so I'll post my findings. Planning on dumping all my music and maybe a few videos.
ashdog said:
I ordered a 32GB Lexar Class 10 microSDHC. Should be getting it today so I'll post my findings. Planning on dumping all my music and maybe a few videos.
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Looking forward to your findings! BTW, where did you purchase it? Thanks.
Bought the Patriot 32g class 10 ...and its crazy fast. Love it.
Sent from my Atrix using XDA Premium App
s1ickwi11y said:
Bought the Patriot 32g class 10 ...and its crazy fast. Love it.
Sent from my Atrix using XDA Premium App
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Excellent! I'll be picking one up. Thx.
I bought the Lexmar 32gig class 10. I don't see a huge difference unless I'm loading up the card with a lot of files at once.
Yes its as fast as the Patriot from all the specs I've seen but unless you can truly afford the minor difference, just get a lower class.
Sent from my MB860 using XDA App
Saw a post FROM MOTO on the moto forums that says the Atrix can make use of the extra speed up to Class10.
FWIW.
My Kingston class 10 32GB card does not play nice with webtop2sd. However, I can format it with the system. I have not tried to write files to it but writing fat32 filesystems works for sure. It seems as if I can read from the card too. I see the folder created during the fat32 partition creation.
The issue I seem to have is that it cannot create extfs filesystems on the card using the phone. I can use gparted to make the filesystem, but then webtop2sd cannot read it.
is sandisk class 4 going to be recommended again?
On the Nook Color I've read the sandisk are usually the most stable and the class 4 was the most idea (even over higher classes.)
I was wondering if this is still the case before I spent 20$ on a 16 gig sd card.
Without a doubt. It has to do with sandisk class 2 and 4 cards providing random access to small amounts of data at speeds that are 10-100 times any other brand.
All the other brands are trying to make really big chunks of data write faster (think copying over movies faster) so I don't see anyone competing with sandisk here.
you didn't specifically mention what you were going to do. if in theory you plan on running cm7 on a sd card, then go with sandisk class 4. If you are only using it for storage and plan to run cm7 off of internal you can get a higher class rating for higher transfer feeds of large movies etc. unless you plan on running applications off of sd card where I think you would want the sandisk.
Snow_fox said:
is sandisk class 4 going to be recommended again?
On the Nook Color I've read the sandisk are usually the most stable and the class 4 was the most idea (even over higher classes.)
I was wondering if this is still the case before I spent 20$ on a 16 gig sd card.
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I'd suggest class 10 honestly ...
I have a Kingston class 10 16gb and a SanDisk class 4 32gb and the class 4 SanDisk trumps the Kingston everytime, except during transfers directly from a computer. The SanDisk benchmarks much better also
Sent from my PC36100 using XDA Premium App
dexx0008 said:
you didn't specifically mention what you were going to do. if in theory you plan on running cm7 on a sd card....
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The title of the thread specifically mentions booting, which means specifically running an operating system from the card.
Voyaging said:
I'd suggest class 10 honestly ...
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Your suggestion is horribly wrong. Objectively, very very very wrong.
ylixir said:
The title of the thread specifically mentions booting, which means specifically running an operating system from the card.
Your suggestion is horribly wrong. Objectively, very very very wrong.
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I saw 10 card in another thread (since deleted?) where someone posted about a sale on a 32GB class 10 card. Without researching the card I happily posted to the thread saying that class 10 sounded like a good idea as I like to write gigs and gigs of data (MP3s, videos) to the card for consumption. I didn't stop to think about random reads or writes nor did I consider other uses.
This same kind of info was then posted there. I removed my foot from my mouth and noticed that, yes, in most cases, normal people doing normal things (i.e. running apps, writing small files, etc.) will generally be more happy using a class 2, 4, or *maybe* 6 in their tablet. Save the class 10 for the high-def video camera that needs fast, sequential writes. Save the dough when getting a card for your tablet: do some research and pick the card best for you based off REAL-WORLD BENCHMARKS. (Save you some time - you generally will do just fine picking up a SandDisk card.)
Although 99.999999999999999% of the MicroSD Cards which are 32GB are Class 2, I noted that the 16GB which Verizon stocked in the Rezound is a Class 4. I suspect that means we should go no lower than Class 4.
Anyone know of a good and legitimate 32GB SD card which is Class 4 or even better? I note that Class 6 and Class 10 all tend to be brands I have never heard of (other than 1 by PNY).
Recommendations are appreciated.
Sandisk has a class 4 32gb micro on Amazon for $37. I just ordered mine, and it should be here in a few days. I'll let you know what I think of it when it gets here.
Anything faster?
Anyone successfully use a Class 6 or 10 that was NOT a fake and actually worked close to speed?
This is a Class 10 but I don't want to guinea pig it
http://www.amazon.com/PNY-microSDHC-Flash-Memory-P-SDU32G10-EFS2/dp/B005BOMU3K
Someone put in a 64gb, don't know what class, and the RZD formatted it and it worked.
http://forum.xda-developers.com/showthread.php?t=1353148
I asked about class in there and someone said unless you are going to move large amounts of stuff regularly then class 2 or 4 is fine.
feralicious said:
I asked about class in there and someone said unless you are going to move large amounts of stuff regularly then class 2 or 4 is fine.
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Yeah, the only real difference is the transfer time. If you're swapping a lot of data on a daily basis (like copies of your BluRay movies), then a higher class rating makes it go faster, but doesn't have any other effect on the performance of the phone, to my knowledge.
Apsalus said:
Yeah, the only real difference is the transfer time. If you're swapping a lot of data on a daily basis (like copies of your BluRay movies), then a higher class rating makes it go faster, but doesn't have any other effect on the performance of the phone, to my knowledge.
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JD, there's a thread elsewhere on xda that talks about card speeds and basically recommends that the sweet spot is a 32g class 4 card. I have 3 of 'em (all bought at various sales just under $40). One is in my Rezound; one is in my tablet, and one is kept synced to the one in my phone via Microsoft Synctoy....because all cards ultimately fail.
i was reading somehwere that this may affect the speed of how videos write to the card if you save to card..is that true?
i'm gonna get a 32 gig as well, but should i go for class 4 or 6?
hgoldner said:
JD, there's a thread elsewhere on xda that talks about card speeds and basically recommends that the sweet spot is a 32g class 4 card. I have 3 of 'em (all bought at various sales just under $40). One is in my Rezound; one is in my tablet, and one is kept synced to the one in my phone via Microsoft Synctoy....because all cards ultimately fail.
Click to expand...
Click to collapse
Do you have an amazon link to the one you found to be the best?
feralicious said:
Someone put in a 64gb, don't know what class, and the RZD formatted it and it worked.
http://forum.xda-developers.com/showthread.php?t=1353148
I asked about class in there and someone said unless you are going to move large amounts of stuff regularly then class 2 or 4 is fine.
Click to expand...
Click to collapse
Yeah that 64 GB is a class 6. It's part of Sandisk's new mobile ultra cards. They make em in all sizes I believe.
jayochs said:
i was reading somehwere that this may affect the speed of how videos write to the card if you save to card..is that true?
i'm gonna get a 32 gig as well, but should i go for class 4 or 6?
Click to expand...
Click to collapse
That's a valid concern. I don't know the bitrate at which the camera records the various formats that it is capable of, but I'd say that a Class 4 is a safe bet in any case.
For a smartphone doing HD recording you want "atleast" a 4. Anything slower might get stuck in swapping. Personally I think it's one of those things with go with what you can afford/feel comfortable with. Though I'm also using a class 10 16GB since I can't stand being bogged down on transfers. I mean honestly, it's an LTE phone, not an HD camera. I don't need a 32gb, I stream everything.
Play back is a different story, a class 2 32gb works fine as long as the app does proper buffering. Though it will always load faster with a faster SD card.
"Sandisk has a 64GB micro SDHC card out, although its $219."
Ouch. Not cheap.
surfer2.3 said:
"Sandisk has a 64GB micro SDHC card out, although its $219."
Ouch. Not cheap.
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This one works and is a much better price, especially when mom gives it to you for xmas.
http://www.amazon.com/SanDisk-Mobil...510U/ref=sr_1_2?ie=UTF8&qid=1326679568&sr=8-2
Thread about it here:
http://forum.xda-developers.com/showthread.php?t=1353148
hello i just got an amaze and with its camera and video quality i think i need a better sd card as my current one is class 2. any recommendations and letting me me know what the phone can handle without paying for more than i need would be greatly appreciated.
thanks very much
The Amaze can handle a class 10 memory card. This would be preferred as it has the fastest read and write speed that I know of. I am currently using a 16GB class 6 SanDisk and it works really well.
Hope this is helpful. Or maybe someone else can give you more info.
Sent from my world to yours using an HTC Amaze
windcan said:
hello i just got an amaze and with its camera and video quality i think i need a better sd card as my current one is class 2. any recommendations and letting me me know what the phone can handle without paying for more than i need would be greatly appreciated.
thanks very much
Click to expand...
Click to collapse
This should do the trick.
http://www.amazon.com/AmazonBasics-...H4U0/ref=sr_1_2?ie=UTF8&qid=1325371114&sr=8-2
Looks like it may be worth it to go straight to class 10.
Thanks
PNY class 10.
Sent from my HTC Amaze 4G using xda premium
I just got a Samsung 32gb class 10 and it works great.
what is "PNY"?
windcan said:
what is "PNY"?
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PNY is just a brand
Picked up a Lexar 32gb class 10 for $45 on boxing day. (for you Americans, that's the day after Christmas)
lol
marleyfan61 said:
Picked up a Lexar 32gb class 10 for $45 on boxing day. (for you Americans, that's the day after Christmas)
Click to expand...
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Sent from my HTC Amaze 4G using XDA Premium App
Confused
My Amaze is on it's way to my door this Wednesday, and I too am on the hunt for a good class 10 micro SD card. I had a Patriot 32 GB ordered from Amazon (it had 4+ stars), but then I started reading specific user ratings. It almost looks as though there is a problem with quality/consistency with many of the 32GB class 10s. The Patriot, and several others, had quite a few recent users complain that their class 10 doesn't run any faster then their old class 2 or 4. (The complaints I tried to focused on are from users who had run speed tests and didn't just provide seat-of-the-pants analysis.) Admittedly, I was going for as cheap as I could (the Patriot was only $47), but I looked at several others and they had spotty speed comments as well.
Does anyone have specific knowledge or insight on this? Is it an issue with lower cost manufacturers whereby one card is great but the next can be dreadful. Is it the nature of the beast?
I appreciate your comments.
A class 10 card isn't the way to go with smartphones. Best to get a class 4.
Sharpshooterrr said:
A class 10 card isn't the way to go with smartphones. Best to get a class 4.
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really, class 4, why?
too late for me, order my 32gb class 10
curious to understand this whole thing
thanks
Sharpshooterrr said:
A class 10 card isn't the way to go with smartphones. Best to get a class 4.
Click to expand...
Click to collapse
I could understand saying a class 10 isn't necessary, but to say it isn't the way to go, a class 4 is best doesn't make sense. Care to explain why?
UHS-1 Cards
I just read where UHS-1 class microSD's "were made for mobile devices". Something about being specifically designed to work with those operating systems. Anyone have experience with any of those? They're awfully expensive.
If you uses a class 2 SD card with a capacity of less than 16Gb and mostly uses it to transfer small files between your phone and PC - that would be sufficiency enough.
If you intend to use a bigger card, say, 32Gb or 64Gb and you are doing a lot of transferring MP3, movies, pictures ect ... especially if moving BIG files, say, more than 1 Gb each (e.g a full MP4 movie may take up to almost 2Gb)
OR
You are frequently backup your SDCard contains and moving them between PC and phone. You will appreciates the higher speed/class of your SDCard. Higher class means higher speed in reading and writting hence saving you a lot of time.
You will not notice much differences between a class 2 and a class 10 card when using it inside your phone though.
An SDCard speeding test's result will be differ from devices and that's exactly manufacturer's stated on their package/info, but, basically you got what you paid for. As we all know, Sandisk is the most expensive card out there and there is a reason for it, just do a little research and you'll know why. Sandisk classed their card at the minimum speed that their cards are capable of, whereas other manufacturer tend to class their card at the average speed that their cards capable of. Meaning a classs 10 Samsung/PNY/Patriot card may not capable of reaching the claimed speed (because, well, results are varies on devices) and the result maybe a little lower than claimed (I've tried Samsung class 10 and PNY class 10 test and the result is somewhere more or less than 9Gb/s writting).
Anyway, a class 2 16Gb Sandisk card is good enough for an average user whereas a higher class/capacity card will increase performances for those who demand more for their task/hobbies/usage
I would agree with the post above, right on the spot. I had a 8 gb class 4, 16 gb class 4, and now 32gb class 10. Did not visibly notice speed in my phone but did notice it when transferring files. You will only benefit when transferring larger files like 1 gb or more.
I only transfer my recorded videos, pictures, mp3 and that's it. I think i once transferred a movie or two.
What would have taken me 1 hr on 16 gb class 4 took me 20 - 30 min on my patriot 32 gb class 10. No problems on it since nov so far.
Sent from my HTC Amaze 4G using xda premium
Sharpshooterrr said:
A class 10 card isn't the way to go with smartphones. Best to get a class 4.
Click to expand...
Click to collapse
I have a class 4 card and the video is choppy when using HD recording. It can't write the larger amount of data fast enough.
A class 10 FTW
marleyfan61 said:
I could understand saying a class 10 isn't necessary, but to say it isn't the way to go, a class 4 is best doesn't make sense. Care to explain why?
Click to expand...
Click to collapse
http://www.xda-developers.com/android/32-gb-micro-sd-analysis-speed-test/
anything over class 4 sacrafices random read/write speeds...meaning, just to write faster the data is more fragmented. Over time, the speed becomes slower and the table used to keep track of data must access parts of the fragments that are free...this reduces performance in higher class cards...if you look at Sandisk they their class two performs way above the minimum write speed, almost double...I always buy sandisk...nothing else...their quality is unmatched...they are the pioneers...A class 4 or class 6 sandisk would outperform many of the class 10's that people are buying right now.
Sometimes as Binary's card has, they lose integrity because of this reason...the index becomes messed up and the data becomes lost eaiser in higher class SD cards and lower quality SD cards...I believe Sandisk tries to minimize this even in their higher speed cards...
---------- Post added at 05:56 AM ---------- Previous post was at 05:34 AM ----------
If you guys take a look at the bitrate of the 1080p video and also add the audio bit rate it doesn't even come close to being 2 MB/s write speed which is a class 2 SD card...the highest bitrate for video I got was 11182 (kilobits per second) = 1.36499023 megabytes per second...add the 127kbps of sound and you barely have 1.4 MB/s write speed needed for the HD video recorded by our amaze...hope this clears things up.
Is there anything to be said about what type or make of micro SD card is better or worse for the prime? I remember seeing something about a certain class being better for HD video recording (for the Desire HD).
Just wanted to check / discuss before purchasing
Cheers.
Sent from my Transformer Prime TF201 using xda premium
At least a class 6 I guess like on other devices.
I got a 32GB Patriot Class10 on order. Will let you know how it performs with hidef movies. Hopefully early next week.
Cheers!
for things like recording, or anything that needs to be able to write to the device faster, generally speaking, a higher class should yield better results.
but for general use a class 4 and above should be just fine.
yup, read speeds are generally the same regardless of class.
the "upper class" cards simply have higher "burst" write speed (and also generally at the expense of random write performance).
You can buy a 32gb class 4 from sandisk. It might be a class 4 but quite honestly, it is faster than most other brands class 10.
Okay, I'll go for the SanDisk 32GB I was looking at when I thought of making this thread.
Cheers guys.