Develop Bugs

[Q] Why class 6 SD card?

Hi all,
I've read in a few places that if you want to run apps from your SD card that you should have a class 6 SD card. Can anyone explain why this is? I've currently got the one that came with the phone, which is class 2. Just want to understand why I need it before splashing out the cash
Thanks

It's all about speed. Class 6 is faster than Class 4 is faster than Class 2. If you are happy with the performance with your Class 2 card, no need to splash out the cash.

yeah its just about speed, the higher the class the faster the r/w speed, you dont really need a class 6 these days tho, maybe in the old days of the g1/hero but not now

There's quite a bit of discussion on this and I'm honestly quite confused over this as well.
The higher classes just means faster write speeds but same read speeds. Certainly, this shouldn't affect the performance of apps that are installed on the card; unless the card is being used for swap memory.
Anyway, I've heard some users with 32GB microSD card (only available in class 2) using app2sd with no ill-effects. I've recently purchased one myself and will be swapping it out later tonight.

newbie on Android here.....may I ask....Im currently using a 16Gb mem card....If I change it to a 32Gb, what are the files that I need to copy to the new card, so that the apps/games currently installed will still run? I noticed there are so many folders inside my memory card now.....which one should I transfer to my new card? Or should I need to re-install the apps?
thanks..

dinoalbert said:
newbie on Android here.....may I ask....Im currently using a 16Gb mem card....If I change it to a 32Gb, what are the files that I need to copy to the new card, so that the apps/games currently installed will still run? I noticed there are so many folders inside my memory card now.....which one should I transfer to my new card? Or should I need to re-install the apps?
thanks..
Click to expand...
Click to collapse
are you using apps2sd? or just running a stock like rom?

9 out of 10 users on this website would not be able to tell the difference in speed by running apps on a class 4 or class 6 cards.

AndroHero said:
are you using apps2sd? or just running a stock like rom?
Click to expand...
Click to collapse
I am using an OTA Froyo but already rooted....

Before the usual flamers get to write on this topic to say high-class cards are useless, it really comes down I think to the time you have available to wait for USB transfers. On a class 2 it takes AGES. I bought a class10 16gb and it's an absolute life changer (i do have a lot of public transport so I make heavy use of my phone as a video player)

phentex said:
Before the usual flamers get to write on this topic to say high-class cards are useless, it really comes down I think to the time you have available to wait for USB transfers. On a class 2 it takes AGES. I bought a class10 16gb and it's an absolute life changer (i do have a lot of public transport so I make heavy use of my phone as a video player)
Click to expand...
Click to collapse
Another reason to have a class 4 or faster card in the phone is to have reliable 720p 25fps video recording. On my Class 2 with a2sd+ recording stutters.

thanks for the responses. from what i read previously, it talked about class 6 cards being less likely to be unmounted and causing problems to running applications. does this mean anything to anyone?!

Kashban said:
Another reason to have a class 4 or faster card in the phone is to have reliable 720p 25fps video recording. On my Class 2 with a2sd+ recording stutters.
Click to expand...
Click to collapse
This is the reason when I eventually get the money I'll be getting a 16GB class 4 or 6 card. At the moment 720p is fairly pointless to me since I can't get smooth recordings with my SD card.

Have no issues with my 16Gb Class-2 sdcard. R/W speed enough to handle 720p recording and rockplayer playing avis perfectly.
Sent from my HTC Desire using XDA App

iLHaNroID said:
Have no issues with my 16Gb Class-2 sdcard. R/W speed enough to handle 720p recording and rockplayer playing avis perfectly.
Sent from my HTC Desire using XDA App
Click to expand...
Click to collapse
Are you running A2SD or a2sd+ on your phone? If not, that may be the reason.
The more apps and widgets and stuff is moved to the sd, the more r/w-access happens to the card, which has serious impact on video recording. I really wish the internal memory of the Desire wasn't so small. What the heck did HTC think by putting only 560 MByte internal storage into their android flagship? The SGS has 5 GiBytes!

jstegeman said:
It's all about speed. Class 6 is faster than Class 4 is faster than Class 2. If you are happy with the performance with your Class 2 card, no need to splash out the cash.
Click to expand...
Click to collapse
Incorrect!
The class of the card doesn't tell you the speed of a card - it tells you the *minimum* sustained write speed on a card which is completely unfragmented
A good quality class 2 card can and often will be faster than a poor quality class 6 card.
The two Sandisk Class 2 card I use both write at around 7.5mb/s, which is faster than the class 6 minimums.
Regards,
Dave

foxmeister said:
Incorrect!
The class of the card doesn't tell you the speed of a card - it tells you the *minimum* sustained write speed on a card which is completely unfragmented
A good quality class 2 card can and often will be faster than a poor quality class 6 card.
The two Sandisk Class 2 card I use both write at around 7.5mb/s, which is faster than the class 6 minimums.
Regards,
Dave
Click to expand...
Click to collapse
That's interesting info! Would explain why I have far fewer problems than most people report with 720p recording onto my class2 card.
So the real answer is: Benchmark your write speed before making any big purchasing decisions on SD cards.

Kashban said:
Another reason to have a class 4 or faster card in the phone is to have reliable 720p 25fps video recording. On my Class 2 with a2sd+ recording stutters.
Click to expand...
Click to collapse
so a class 4 good enough for 720p? i have a class 2 right now and the recording is just horrible.. i thought that my phone was broken and have changed many custom roms

Bought a C6 16gb to replace C2 4Gb - definitely faster as USB drive - both Sandisk

16 Gb Micro Sd class 10

I wanted to let anyone looking for a micro sd about a deal i found. I found a Patriot Memory 16gb micro sdhc class 10 for $39.99 on www.CompUSA.com I think i'm going to order one after reading here on xda that patriot makes a pretty reliable sd card. I haven't ever used a patriot memory product so i only know what guys on here have posted. anyone make sure you check into the company on your own. They have the wintec 32 gb class 10 for $84.99 too!

apparently class10 cards are no good for phones, take a look at this link

yeah you dont want to spend all the money on something that might not work right?

I had read here on xda that the class of the sd card doesn't matter but the size(gb) is what matters with phones. like my SE X10 is only compatible with up to 16gb of external memory. Is that not correct? Can anyone clear this up for me?

X10's are compatible with up to 32gb microSD cards, I've got one in mine.
The size is important as you want to buy an SD card that works for the content that you intend on putting on it. If you have a lot of MP3s and videos, take a lot of pictures and shoot a lot of videos then obviously you are going to want at least a 16gb SD card.
The class does indeed matter. If you have hundreds or thousands of images then a class 2 card would take ages for them to all load in the Gallery. Or if you use App2SD at all a class 2 card wouldn't be able to keep up with the reading and writing and the app would be sluggish.
A class 10 card in my opinion is a bit excessive, I'd personally go for a class 4 or 6.

Pawnty said:
X10's are compatible with up to 32gb microSD cards, I've got one in mine.
The size is important as you want to buy an SD card that works for the content that you intend on putting on it. If you have a lot of MP3s and videos, take a lot of pictures and shoot a lot of videos then obviously you are going to want at least a 16gb SD card.
The class does indeed matter. If you have hundreds or thousands of images then a class 2 card would take ages for them to all load in the Gallery. Or if you use App2SD at all a class 2 card wouldn't be able to keep up with the reading and writing and the app would be sluggish.
A class 10 card in my opinion is a bit excessive, I'd personally go for a class 4 or 6.
Click to expand...
Click to collapse
nice info....

how do i know
I have3 a 16 Gb SD card... and I recently bought 2 16 GB sd cards 4 a x10 mini and a sam 5560... but both haven´t the blister. so how do I know (with an android app) which class are they... even mine... because was a operator gift.
I tried with SD tools... but even in that app ask me what class is my card... so bad...
can u help me?
thnks
salu2

Pawnty said:
X10's are compatible with up to 32gb microSD cards, I've got one in mine.
The size is important as you want to buy an SD card that works for the content that you intend on putting on it. If you have a lot of MP3s and videos, take a lot of pictures and shoot a lot of videos then obviously you are going to want at least a 16gb SD card.
The class does indeed matter. If you have hundreds or thousands of images then a class 2 card would take ages for them to all load in the Gallery. Or if you use App2SD at all a class 2 card wouldn't be able to keep up with the reading and writing and the app would be sluggish.
A class 10 card in my opinion is a bit excessive, I'd personally go for a class 4 or 6.
Click to expand...
Click to collapse
This is very true. I have a class 2 card and loading thumbnails for artists/albums is painfully slow in mediascape. I would go for a 32 GB if you are a music fan. I have a 1800 songs on my X10 and its already full. Class 4/6 should be good, class 10 is a little excessive.

georgegon60 said:
I have3 a 16 Gb SD card... and I recently bought 2 16 GB sd cards 4 a x10 mini and a sam 5560... but both haven´t the blister. so how do I know (with an android app) which class are they... even mine... because was a operator gift.
I tried with SD tools... but even in that app ask me what class is my card... so bad...
can u help me?
thnks
salu2
Click to expand...
Click to collapse
Just take the card out of the phone. There should be a 'C' printed on the card and there will be a number inside the 'C'. This is the class of your card.

I was using stock 8 GB class 2, I brought Team 16 GB class 10. Difference in performance is noticeable.

I have a class 10 8gb card and it works way better than the stock card.
Just make sure you tweak your read_ahead_kb.. Search for SD card speed improvement or speed increase.

In general, Class 4 or 6 are good enough for the application usage by phone, such HD video and phones.
I tested my Class 4 sd card, it able to transfer ~5.5mb / sec, not bad.
Yes, when price come down, I will get a Class 100 sd card too.
cheers

I'd rather the class 200.
Sent from my X10i using XDA Premium App

Class 10 significantly improves the performance.
Honestly it does not matter if someone is using the SE stock rom...however since I have tried the awesome ROM created by wolfbreak...my apps stored in sd was very sluggish...had to buy a class 10 16 gig to improve the performance...

Just got a 16Gig class 4 card...goto to play with data2sd and see the quadrant!!!!!!

kxhawkins said:
I'd rather the class 200.
Sent from my X10i using XDA Premium App
Click to expand...
Click to collapse
LOL
Sent from my X10i using XDA Premium App

Is there maybe an app or system menu which I could use to determine the class of my microsd card?

donnytuco said:
apparently class10 cards are no good for phones, take a look at this link
Click to expand...
Click to collapse
If you get a real kingston class 10 you will get five times the speed of a low spec class 2 generic sd card.
Rollhard said:
I had read here on xda that the class of the sd card doesn't matter but the size(gb) is what matters with phones. like my SE X10 is only compatible with up to 16gb of external memory. Is that not correct? Can anyone clear this up for me?
Click to expand...
Click to collapse
Real Class 10 SD cards work at 10MB/s of data transfer speed.
Class 2=2MB/s
Class 4=4MB/s
Class 6=6MB/s
Class 8=8MB/s
Class 10=10MB/s
The best are as said by others Kingston and Sandisk.
I've a Sandisk class 6 card and i get near 5,5MB/s of data transfer.
Mine is still 8gb, i want to buy another but in Brazil it's very expensive, the taxes are very high.

Got the Wintec Filemate 16gb class 10 for just under $40 at Frys Electronics and it's given me no problems. Used it in my NookColor running tons of apps and music from it without a hitch. Now it's in my X10 and with using the SD Speed Up tools, it helped alot.
http://forum.xda-developers.com/show....php?t=1028465

arcturusx said:
Is there maybe an app or system menu which I could use to determine the class of my microsd card?
Click to expand...
Click to collapse
Just take it out and look at at.
There will be a letter C with a number in it....that will be the class of the card

[Q] Class 10 MicroSD Issues

Hello, I bought some day ago a Team 16GB class 10 Micro SD card, but my Defy freeze, expecially when I browse it with quickpic.
I see some thread about class 10 cards and someone found that a partial fix is format with 32k or 64k as file allocation unit size, and maybe another fix is set higher voltage with setsvel.
I've tried the format fix, but I gain only speed, now I'll try the second to gain the needed stability.
I read also that it's an Android kernel related issue, so we still need an official fix.
Someone know some other method?
D_L
Edit: Also the voltage tweak have failed... It's frustrating...

There maybe something related to the manufacturer. For example in my country the cheepest MicroSDHC Cards are made by Adata and Serioux (there maybe other chinesse brands but these are present at known big IT stores).
So people bought them, especially Adata ( which should be better than Serioux).
Class 6/10... and they ended up not working.
So my advice is to try with a Knigston/Kingmax/Transcend/ Sandisk( not that cheap) same 16gb and same class, see if you see a difference.
And i think Class 6 is enough... if let's say Class 10 from the manufacturers above it too expensive.
Maybe it helps.

Transcend?? um.. i don't think so, it's just the same.
perviously i had Transced 8 GB class 6,
using my old galaxy android, it's so fine and speed is good.
but after went to Defy, it was horrible.
often to cause hangs!
have to unmount / remount, which often not succeed, and have to pull out battery.
and it's especially happen when taking picture with camera or downloading + listening to mp3.
many good moments missed, can't take picture, because have to pull out the battery,
and that's embarassing, in front of my friend.
they think i have a smartphone but often hangs,
and now i know it is just because highclass sdcard.
i am using class 2 sdcard now, never get hangs.
end of problem.

I had the same problem.
I bought a 16GB class 10 SDHC ab. a month ago and when I'd been using my Defy always been freezed when I opened the Gallery or any else card related application.
I deleted the partition on the card and created a new one without LBA mode and the problem had been solved temporary. After a week it was start to make freezes again.
Actually I'm using a 16GB class 2 one (I bought it for 15 pounds as used). There's no problems any more, and it works as the same speed as the class 10 one (by the SD Tools).

I gave up and went back to a class 6 8GB Samsung, i did start a thread on the official Motorola forum if you want to go let them know about the problems, it might get them to issue a fix if more people start to complain about it. https://supportforums.motorola.com/thread/53050?tstart=30

i tot only me..
same here..
wanna sell my DNA 16GB class 10.
phone hang quite easily after change to this

So i want to buy a 8 gb card class 4 or 6 tomorrow... and it must work would CM7 . What to get ? I understand that using Sd booster or CM7 default i should get the same speed acordingly to what i set ?
Sent from my MB525 using XDA Premium App

Deonix said:
So i want to buy a 8 gb card class 4 or 6 tomorrow... and it must work would CM7 . What to get ? I understand that using Sd booster or CM7 default i should get the same speed acordingly to what i set ?
Sent from my MB525 using XDA Premium App
Click to expand...
Click to collapse
Hi Deonix.
My SD is a SanDisk 8GB class 4 and working well.
A couple days a go i try to use my other SD 16GB (class 10) and had issues, so i back to the 8GB class 4.
Some users have 16 and 32GB class 2 and 4 and they have no problems.

Thanks... i will choose a class 4 probably Kingmax. Anyone with working Class 6 8gb? what manufacturer?
Question: i will have on my 8 gb card a bunch of apps-30-40... some games including Asphalt 6 < for example>, MotoNav, and music. Out of this i think i will still have 2-3 Gb free . I don't need to transfer data from Card to PC frequently (fast i mean) maybe when it happens i will use the phone as a mass storage.
The question is: Do i need a class 6? I only need to work properly while in the phone and have a decent speed as a Mass storage from time to time.

definetely is not cm7 problem,
i thought it was.. and many people thought it too.
maybe it's froyo kernel seems little bit buggy with hiclass sdcard.
and cm7 using froyo kernel though.
using class 2 sdcard is perfect.
the speed is just the same though.
have been checked with some bencharking tools.

Both me and the missus are using class 6 samsung cards this one to be precise http://www.amazon.co.uk/Samsung-Micro-Speed-memory-Class/dp/B002WGIV10/ref=pd_rhf_shvl_44 and it works greatSD tools shows a write speed of around 10MB/s and a read speed of around 21MB/s

actually, i'll buy SD Card Team 16 Gig class 10..
any problem with froyo for class 10 ?
need more advice from u guys

Garincha13 said:
actually, i'll buy SD Card Team 16 Gig class 10..
any problem with froyo for class 10 ?
need more advice from u guys
Click to expand...
Click to collapse
many people confirm there's a problem with that,
even with 6 class sdcard.
i don't know what's going on but it's happening and annoying,
it happens on froyo, and CM7 too (FYI, CM7 Quarx uses froyo kernel).

Garincha13 said:
actually, i'll buy SD Card Team 16 Gig class 10..
any problem with froyo for class 10 ?
need more advice from u guys
Click to expand...
Click to collapse
Thats what we are all saying, class 10 cards seem nothing but a problem regardless of size. This is why i went back to the class 6 samsung and posted a link to it cos i know it works.

Just bought a 8 gb Kingston class 4. Will report speed and any other issues as soon as i install CM7 with it.
Hope it works well. It's an Android Kernel issue from Froyo on the Class 6/10 crashes as i can understand.. nobody's fault ( here on XDA i mean). Still some work.
Also i remain strong on my position.
Choose your manufacturer wisely even if it costs 10-20$/i dunno how much more.

I use kingmax 16gb class10 allways hang,
so bad,
use class 4 or 2 batter
Sent from my MB525 using XDA Premium App

i nearly bought a 16GB Lexmark class 6 card today but i dare not in case it didnt work, this is a crap situation.

Same here - Froyo 2.2.2 and Transend 16GB Class10 - freezes at random basis and random applications. No issues with 8GB Class 4.

I have similar problem, how do I know the class of the card? It is I believe a Kingston, I've had it for ages.
Also if it is relevant to someone, I have a Defy from CEE distribution, with Froyo.

Fabo.sk said:
I have similar problem, how do I know the class of the card? It is I believe a Kingston, I've had it for ages.
Also if it is relevant to someone, I have a Defy from CEE distribution, with Froyo.
Click to expand...
Click to collapse
You can check if the class is printed on the card. Usually it is a number inside a letter "C" (like a full circle).
You can see the images here:
http://en.wikipedia.org/wiki/Sd_card#Speed_Class_Rating

Maximum size sd card with g2

Bought a 32 gb micro class 10 today and its acting really weird. Still have my 16gb and it works perfect.
Running stock 2.2 still, is 16gb max or what? If yes and I upgrade to 2.3 legit upgrade will it work with a 32 gb?
Sent from my T-Mobile G2 using XDA App

No, it's the class 10. Lot's of threads on this, try a class 6 card.

Class 10 is not so good on desire z. Try a class 4 or 6 card
Sent from my HTC Vision using XDA App

Ok so... I bought another one with a class 4.
Class 10 no name: everything works normal but transfer is super super super slow...
Class 4 kingston: weird when I open my computer and turn on the usb connection the H drive (sd card) keeps showing up and disappearing then showing up and disappearing over and over... wtf gives?
Sent from my T-Mobile G2 using XDA App

ok so im throwing both the sd cards in the reader and formatting them. see if that fixes my problem.

if you still got the packaging and recipt you can still return the cards if they dont work

I'm running a 32GB Class 10 card with no problems. Maybe it's just your card. I had problems with the partitions on my original Wintec card and the company sent me a new one as a replacement.

blackknightavalon said:
I'm running a 32GB Class 10 card with no problems. Maybe it's just your card. I had problems with the partitions on my original Wintec card and the company sent me a new one as a replacement.
Click to expand...
Click to collapse
Ya, thats the one. Finished formatting and copying files to the cards. The Wintec one which is class 10 is running a little bit weird. I'm try the kingston class 4

evilcuber said:
Class 10 is not so good on desire z. Try a class 4 or 6 card
Click to expand...
Click to collapse
I have 16GB Class 10 Joyflash (noname). Could you tell, why Class 10 "is not so good on desire z", becouse I dont understand this.
If card reader of desire is slow, on level of Class 6, if you put Class 10, doesnt change anything, but why "is not so good"?

I can safely say that my 32 GB class 6 has no issues. I've been reading on the subject and for some devices the class 10 is flaky... might just be a firware/software issue. Who knows.
But I'm ok with my class 6. Write: 9mb/s and read 24.3m/s

Ok so after everything last night I ended up keeping the kingston class 4 instead of the wintec class 10.
One thing that everyone should know if they are planning to upgrade soon and have forgotten this. The speed to write to a micro sd is slow then the speed to copy from a micro sd. This is my experience last night at least... I can copy a certain file to my desktop in 40 seconds but to put it on took 2-3 minutes.
Anyways, just be patient and go to a place you can get refunds so you dont get screwed with a bad card lol. With my experience the 32 gb class 10 wintec sucks, the write speed was insanely slow. So I stuck with a name brand instead, I really wanted a sandisk but they werent available.

Mog said:
Ya, thats the one. Finished formatting and copying files to the cards. The Wintec one which is class 10 is running a little bit weird. I'm try the kingston class 4
Click to expand...
Click to collapse
Actually, my original Wintec card was screwing up and wouldn't keep the data partitions written. The replacement I got from Wintec is working the way it should, and it actually is acting like a class 10 card.

Mog said:
One thing that everyone should know if they are planning to upgrade soon and have forgotten this. The speed to write to a micro sd is slow then the speed to copy from a micro sd. This is my experience last night at least... I can copy a certain file to my desktop in 40 seconds but to put it on took 2-3 minutes.
Click to expand...
Click to collapse
Class ratings refer only to write speed. And write speed is always going to be slower than read speed.

redpoint73 said:
Class ratings refer only to write speed. And write speed is always going to be slower than read speed.
Click to expand...
Click to collapse
This AND, class ratings were documented before smartphones for the purpose of professional photography use in cameras. I have never had any speed issue with my good old class 2 card in my smartphone.

iDAREK said:
I have 16GB Class 10 Joyflash (noname). Could you tell, why Class 10 "is not so good on desire z", becouse I dont understand this.
If card reader of desire is slow, on level of Class 6, if you put Class 10, doesnt change anything, but why "is not so good"?
Click to expand...
Click to collapse
Lots of threads on this, search "sd card"
http://forum.xda-developers.com/showthread.php?t=804421&highlight=sd+card
http://forum.xda-developers.com/showthread.php?t=849494&highlight=sd+card
Also, check this out...
http://forum.xda-developers.com/showthread.php?t=1022678&highlight=sd+card

SuperDave81 said:
No, it's the class 10. Lot's of threads on this, try a class 6 card.
Click to expand...
Click to collapse
Thank You: I can confirm this.
I had to put a SD in my old DesireZ/Vision for one of my son (10 years... there's no religion....) to replace a old 4GB crashed one.
The phone is running SenseI ROM (fine ROM: a very good way to replace the stable CM7 and run ICS 4.0)
I bought on Amazon Samsung EVO uSD 16GB Class10... and it was not recognized... So I read it on the PC to see if is was good or not: it was OK!
Recovered the trouble upgrading the Galaxy S2 of the other son from a old 8GB class 4 (probably Kingston o Transcend) to the brand new 16GB EVO Class 10, and putting the old 8GBB in the Desire Z: quickly recognized and optimally mounted both cards over both the 2 phones!
But I was disappointed... more than speed performance I thought that Class 10 memory card were also better on quality, due to a more robust and stable architecture of the chips inside.... and
much more recommended for the "systemdisk-like" use on Android Smartphones!

[Q] SD-card issue

I bought a new Sandisk Micro SDHC 32GB UHS1 to increase a write/read speed to/from sd-card. But the problem is the sd-card steadily unmounted when I listen to the music or watch the movies. I think it‘s because of the class of the sd-card.
Can anyone confirm that this doesn‘t happen with the other class of the sd-card (with the same capacity of 32GB)?
I‘ll be very grateful for this.
Sent from my LG-P936 using xda premium

i have a Sandisk card but mine is only 8gb
it just works fine .
==== OFF TOPIC =====
i'v sent you a PM wich i'm not sure you got !
but please consider helping me on this :
http://forum.xda-developers.com/showpost.php?p=25363995&postcount=54
==================

Machzelet said:
I bought a new Sandisk Micro SDHC 32GB UHS1 to increase a write/read speed to/from sd-card. But the problem is the sd-card steadily unmounted when I listen to the music or watch the movies. I think it‘s because of the class of the sd-card.
Can anyone confirm that this doesn‘t happen with the other class of the sd-card (with the same capacity of 32GB)?
I‘ll be very grateful for this.
Sent from my LG-P936 using xda premium
Click to expand...
Click to collapse
I have a 32gb class 4 SanDisk MicroSD HC card, and I've actually never had any card issues at all, ie unmounting, corrupting, or anything weird. I've seen higher class 32gb cards, but I know how rare it is to have a microSD that doesn't ever give you any problems, so I'm sticking with my slower class 4 that has never let me down since I started using it about 5 months ago.

Well, I found the problem. Our devices are compatible only with microSD cards that have 2.0 interface like classes 2-10. UHS1 cards have a new 3.01 interface, therefore our devices don‘t support the new interface.
Sent from my LG-P936 using xda premium

Machzelet said:
Well, I found the problem. Our devices are compatible only with microSD cards that have 2.0 interface like classes 2-10. UHS1 cards have a new 3.01 interface, therefore our devices don‘t support the new interface.
Click to expand...
Click to collapse
It's supposed to be backward compatible, but I guess things don't always work how they are supposed to.

drumist said:
It's supposed to be backward compatible...
Click to expand...
Click to collapse
I agree. With my Sandisk 32gb (Class 4), I formatted it as FAT32 with 64kb clusters from a card-reader on my PC.
I had unmounting issues as well, but I believe I incorrectly disabled something when I was debloating my Nitro...Once I started using CM9 though, the unmounting issues went away.
* If your Nitro is stock, then I would suggest trying to format your card from a PC and trying again.
* If you're rooted, stock rom and did some debloating yourself...Try getting your phone back to stock and see if you still have issues
* If you're rooted and would like to try a new ROM, definitely try CM9, that will take care of the bloat and potentially the unmounting issues.

Hmmmm I just bought a UHS-1 card, haven't opened it yet. Is this phone for sure unable to take advantage of it?

Machzelet said:
I bought a new Sandisk Micro SDHC 32GB UHS1 to increase a write/read speed to/from sd-card. But the problem is the sd-card steadily unmounted when I listen to the music or watch the movies. I think it‘s because of the class of the sd-card.
Can anyone confirm that this doesn‘t happen with the other class of the sd-card (with the same capacity of 32GB)?
I‘ll be very grateful for this.
Sent from my LG-P936 using xda premium
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Try heading to http://www.sdcard.org and download the SD Card formatter. Format the card and see if it makes a difference (Needs to be done from a Laptop/PC). I know I had to do this with one of my external SD Cards and it started working again, but I did not have the same problem as you.