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#1
thebuell

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Does anyone knows what causes the random umounts and remounts of SD cards? Anything I can do to fix this?

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#2
Davidoff59

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Happens here too on 2 different SD cards.

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#3
thebuell

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I'm inclined to think it is a bug in the SD card controller, so possibly a better or newer driver in the kernel might cure the random umount issues.

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#4
Hogweed

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Have never had a single random unmount myself, I use known good Class 10 (actually benchmarks as Class 15 if such a thing existed) card. Most people I've previously seen with random unmounts have been using Class 4 cards I wouldn't even think of putting anything less than a Class 10 microSD in the phone but apparently people do. I've also noticed a lot of fake known brand-name cards which are marked as say "Samsung Class 10" but are anything but.

However if your card is Class 10 and benchmarks fine then that's not likely your problem. If it is Class 4 then try a Class 10 card.

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#5
Davidoff59

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Both cards work fine in my zte blade but unmount in the g300

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#6
Hogweed

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What Class are they though? Phones should be fine with a Class 10 but the G300 may have problems with slower cards but not with Class 10s or perhaps Class 6. That's all I'm wondering. I do a lot of I/O to my Class 10 SD card and have never seen any problems. Maybe I'm just lucky.

The Class 10 in my phone right now benchmarks four times as fast as some Class 4 cards - that's a huge difference and could easily be enough to trigger some latent timing bug in the code.

Edited by Hogweed, 30 November 2012 - 07:48 PM.

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#7
Davidoff59

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Nit sure what class they are. Had a 2gb sandisk which started unmounting one day so bought transcend 4gb, think its a class 4 and it still does it. I'm thinking its a poor connection at the SD card slot or poor soldering on the phone itself . Maybe a few dodgy ones got out. Had no SD issues with the first SD card on my first g300

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#8
Frankish

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I've got an old 8gb class 4 that has never acted up at all. Not sure its class related.

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#9
Pain_Deluxe

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Never had this problems for month but last days i had it once.

i dont know why i just use since 1week paulM kernel

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#10
bladebuddy

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Hogweed you're chatting s--t, the class of you're sd card is based purely on write speeds. E.G a photographer using boost mode and taking multiple shots , needs a card that writes quickly. A class 10 is know better then any other sd card when it comes to every day usage. It only writes quicker then other lower class sd cards. Or should I say is able to receive information quicker then a lower class sd cards
Has f--k all to do with mounting problems.

Edited by bladebuddy, 01 December 2012 - 01:05 AM.

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Biohazard

#11
thebuell

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Mine is class 10 so it should have worked just fine. I still get the random umounts a few times a day. For now I just put up with it.

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#12
Hogweed

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Hogweed you're chatting s--t, the class of you're sd card is based purely on write speeds. E.G a photographer using boost mode and taking multiple shots , needs a card that writes quickly. A class 10 is know better then any other sd card when it comes to every day usage. It only writes quicker then other lower class sd cards. Or should I say is able to receive information quicker then a lower class sd cards
Has f--k all to do with mounting problems.


Thank you for your childish insults and bad language. Of course the Class is based on the write speed (they also usually have much higher read speeds as well though) . All I suggested as a possibility is that the random unmounting might (just might) be caused by a timing critical bug in low level Input/Output handling. Most people I have noticed before with the problem had not been using a Class 10 card and everyone I personally know with this phone and a Class 10 have never seen random unmounts. Therefore I put forward the possibility that this might be a speed related bug to see if that might fit with what others experience.

And, for my use of the phone I find so many things much faster and smoother with a Class 10 card - especially if I am copying 32GB of data via USB - then it is even quicker than using the phone's internal storage. You might say it is "know (sic) better" but as far as I am concerned it is much better and the apps I have stored on it agree.

In case there is any doubt I am not saying that a Class 4 should not be fine in the G300 - it should do, just slower. I just wondered if the slower the card the more likely the random unmounts caused by the underlying problem.

Edited by Hogweed, 01 December 2012 - 02:49 PM.

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#13
thebuell

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that has not been my experience with this class 10 card, when used in my laptop it is incredibly quick. With this phone still experience random umounts. I'm definitely sure some sort of obscure bug is somehow being triggered leading to the random umounts.

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#14
Hogweed

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Transferring via USB as a Windows drive I get read speeds about 20 Megabytes/sec from my card and write speeds of about 16 Megabytes/sec. It actually benchmarks slightly slower on the phone itself but not by that much.

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#15
bladebuddy

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Thank you for your childish insults and bad language. Of course the Class is based on the write speed (they also usually have much higher read speeds as well though) . All I suggested as a possibility is that the random unmounting might (just might) be caused by a timing critical bug in low level Input/Output handling. Most people I have noticed before with the problem had not been using a Class 10 card and everyone I personally know with this phone and a Class 10 have never seen random unmounts. Therefore I put forward the possibility that this might be a speed related bug to see if that might fit with what others experience.

And, for my use of the phone I find so many things much faster and smoother with a Class 10 card - especially if I am copying 32GB of data via USB - then it is even quicker than using the phone's internal storage. You might say it is "know (sic) better" but as far as I am concerned it is much better and the apps I have stored on it agree.

In case there is any doubt I am not saying that a Class 4 should not be fine in the G300 - it should do, just slower. I just wondered if the slower the card the more likely the random unmounts caused by the underlying problem.


Its the mention " I wouldn't think of putting a class 4 sd card"
That is total useless information that should be erased before people think there is some truth in what you are saying.
People on the forum with a little knowledge have the duty of passing that on.
Recommending you pay top dollar for a class 10 sd card , regarding the post topic is absolutel crap.
The best you can hope for with a class 10 sd card is better bench mark scores and maybe a game loading quicker.
When it comes down to it on Ginger bread as cache was directed to ram you might gain something by partitioning you're sd card and moving cache to it. As a result your sd card might be rendered useless quicker then in normal use.
And that's the bottom line.
All I ask is don't recommend people spend money when they don't need to.

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Biohazard

#16
Cyda

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I'm not trying to get involved in your bitch fight but in all honesty I wouldn't put anything less that a class 6 near a modern smart phone.

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#17
bladebuddy

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I'm not trying to get involved in your bitch fight but in all honesty I wouldn't put anything less that a class 6 near a modern smart phone.

I agree , but recommending a higher class sd card might stop a failure on a sd card mounting is absolute bull s--t.
Cyda I know you have more noodles then that.
I totally respect you're work on the forum , just don't want to see people spending money when it's not needed.

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#18
Cyda

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I wasn't referring to the mounting issue, so I guess I was kind of OT, sorry; I was referring to the overall system performance degradation caused by running a slow sdcard.

6mb/s write speed should be the bare minimum considering current cpu and ram speeds, IMO.

Edited by Cyda, 02 December 2012 - 12:21 AM.

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#19
Davidoff59

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I was going to post a log but I can't. When I attach to post, the screen goes blank on mobile. This has been apparent on both stock browser and opera since the site update about six months ago.Also can't edit posts unless I use stock browser.

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#20
Davidoff59

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Attached File  sd.txt   5.45KB   8 downloadsAttached File  sd.txt   5.45KB   8 downloads

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