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16GB SD cards that definitely work

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#61
samjam

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Interesting. I just took the 16Gb card that didn't work, and put it in an HTC phone. I managed to format it OK in there. I then put it back in my Blade, and formatted it there. It seemed to be working. Then I put it in a PC, and copied files to it. It then stopped working again. I went round the whole cycle, and it's back in my Blade working OK. There's definitely something strange going on here.

Next up is to try to copy the files from my old card using USB cable with the new card in the phone, rather than putting the new card in a PC to do the copy...

Anyone got a good explanation for this behaviour?


I note that my 2G card isn't recognized as having valid partitions when plugged directly into my PC, but is when connected via the phone.

I had put this down to strange block-device wrapping of Android in that it doesn't really expose the full raw device, but the symptoms match what you describe.

I would say this is similar to the old LBA/CHS problem of the victorian age but it doesn't make sense for linearly addressed storage.

But... if keeping the device in the phone works - then do that!

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#62
tdodd

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Interesting. I just took the 16Gb card that didn't work, and put it in an HTC phone. I managed to format it OK in there. I then put it back in my Blade, and formatted it there. It seemed to be working. Then I put it in a PC, and copied files to it. It then stopped working again. I went round the whole cycle, and it's back in my Blade working OK. There's definitely something strange going on here.

Next up is to try to copy the files from my old card using USB cable with the new card in the phone, rather than putting the new card in a PC to do the copy...

Anyone got a good explanation for this behaviour?

There's a post over on the Vega sub-forum where someone complains of problems with a Sandisk 16GB Class 2 card. He also asserts that the error/failure rate with micro SDHC cards is quite high. I have no idea how true that is but it might explain the random nature of problems and successes being reported here.

There is another card thread on the Blade sub-forum where there is the suggestion that the mechanism of resting the card into place on the Blade, rather than sliding it into position as with most devices, is a possible reason for poor contact and thus unreliable connection. This is because debris and oxides are not scraped off as the card is positioned. I have no idea how probable that is as a cause of problems, but it does not seem unreasonable to me.

I think the reality is that we still do not have statistically meaningful results achieved under controlled conditions - different phones, different ROMS, different cards, different USB ports, different people, different climatic conditions - just too many variables and nowhere near enough samples.

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#63
Ralph Martin

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He also asserts that the error/failure rate with micro SDHC cards is quite high.


That does not explain why the same card always works in the PC, always stops working in the Blade if formatted on the PC, and so far, works fine on the Blade if formatted in the Blade.

This includes multiple insertions and removals and re-seatings (the card has now been in and out of my phone perhaps 20 times), so I'd be pretty sure it is not a contacts issue, as the effects are consistent with the state of the card. If it were contacts, it would not show this "history" effect. This seems more consistent with some kind of software issue (depending on the state of the card), not a hardware issue.

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#64
Ralph Martin

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Bang goes another theory. Card worked fine, until I started copy some files to it from my Mac over the USB cable. I then got an "SD Card unexpectedly removed" message.

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#65
stanno

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Bang goes another theory. Card worked fine, until I started copy some files to it from my Mac over the USB cable. I then got an "SD Card unexpectedly removed" message.


That's the exact problem many people had - including me.

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#66
seekr

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another happy user of Kingston 16GB class 4 bought from MyMemory. I got my San Fran during launch week and got the 16GB about a week after that.

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Orange San Francisco on giffgaff. Running FLB-Froyo G2 r5a.

#67
Ralph Martin

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another happy user of Kingston 16GB class 4 bought from MyMemory. I got my San Fran during launch week and got the 16GB about a week after that.


For what it's worth, I even went to the Kingston "verify" site where you could check you had a genuine Kingston card. Mine checked out fine. But it does not work fine.

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#68
Ralph Martin

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That's the exact problem many people had - including me.


So what did you do in the end?

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#69
netdudeuk

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I've got just the same issue with Kingston 16GB Class 4 card. Did you resolve your problem in the end? If so, how?


No but I've been dealing with Kingston directly who have sent me an RMA.

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#70
stanno

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So what did you do in the end?


I bought a different card - see above.

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#71
netdudeuk

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That does not explain why the same card always works in the PC, always stops working in the Blade if formatted on the PC, and so far, works fine on the Blade if formatted in the Blade.


Ah yes, same for me as well but do try this please. I expect miserable failure :unsure: On the phone, simply copy a file on the card and then paste it elsewhere on the card. I used the built-in Filer on the stock B05 ROM. I'd expect that any similar app will give the same result though. My test does at least show that the issue has got nothing to do with the PC OS or drivers. It's a local phone / SD card issue.

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#72
netdudeuk

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For what it's worth, I even went to the Kingston "verify" site where you could check you had a genuine Kingston card. Mine checked out fine. But it does not work fine.


Kingston wanted to verify mine, which is fair enough. Authentic of course :unsure:

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#73
netdudeuk

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Bang goes another theory. Card worked fine, until I started copy some files to it from my Mac over the USB cable. I then got an "SD Card unexpectedly removed" message.


Yes, that's because the phone was probably not writing anything to the card until you used the Mac.

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#74
Ralph Martin

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Yes, that's because the phone was probably not writing anything to the card until you used the Mac.


No, I moved quite a few files around on the card first. It was only when I tried a sustained long write operation it fell over.

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#75
netdudeuk

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No, I moved quite a few files around on the card first. It was only when I tried a sustained long write operation it fell over.


That's more or less like me as well. My copies from the PC gave me more than a zero percent progress bar before the card eventually unmounted. Data volumes seem relevant.

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#76
Dalstorp

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I bought a 16 GB Sandisk class 2 card from sweburn that does NOT work in my Blade :unsure: link: http://www.sweburn.c...t...t=71&page=1
It is not mounted and after I take it out it seams to be slightly hot (this is not the case with any of the other cards)

I have tried with two Kingston 8 GB cards Class 4 and 8 and a 8 GB no name card without any success, the class 4 Kingston works some time for a short while ?!

The 2 GB sandisk received with the phone and a old 2 GB sandisk works fine.


All cards work fine in my cameras, computer, phone, ...

So if I would by the Sandisk 16 GB class 2 card from Play.com would it work and what is the difference from the one at Swedburn?

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#77
jaw838

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Has anybody tried either successfully or unsuccessfully with any of the Transcend cards?

Edited by jaw838, 04 January 2011 - 11:34 PM.

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#78
PeterPandroid

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This memory card problem is quite staggering. Doesn't the OS read the card profile and therefore know how to deal with its capacity/timings? All this Class N does/doesn't work makes little sense with modern serial memory. Well, what I'm saying is that this part of the Android coding appears to be flaky.

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#79
tdodd

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I just Googled "android card error" and one of the first results returned was this software to supposedly cure the problem....

http://aliwaqas.info...h-sd-formatter/

I haven't a clue whether it will do the job, or even if it is safe, and as I do not suffer from the problem and do not have a card reader capable of reading micro SDHC cards I cannot put it to the test, but still....

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#80
Ralph Martin

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I haven't a clue whether it will do the job, or even if it is safe, and as I do not suffer from the problem and do not have a card reader capable of reading micro SDHC cards I cannot put it to the test, but still....


Hmm. I'm trying that now. I'm having to use Parallels on my Mac to run the PC based formatter. At current progress, it seems like it will take over 24 hours (!) to full format my 16Gb card. I dunno if that is what it always takes, or if my card is dud, or if this is the result of using Parallels, but I have little faith in a successful outcome on this one...

Edited by Ralph Martin, 05 January 2011 - 03:02 PM.

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