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rotoflex is offline rotoflex
2013-07-15 , 23:32
Posts: 569 | Thanked: 462 times | Joined on Jul 2010 @ USA
#71
An update:
Last weekend while doing some intensive file reorganization on my N900's SanDisk 64 GB microSDXC card via wifi & SSH, something happened, a couple of files got corrupted, & the whole card became read-only.

Looking around on the internet I saw that others with microSDXC cards had event similar to occur, some fixed by reformatting, some by using the SD card adapter in unlocked mode then reformatting, using different formatting tools like EaseUS, SDformatter, the windows format tool, etc. Many did not get the problem fixed, nor did I.

I contacted SanDisk, & they have been very good about the problem & are offering to replace the card. In the email exchange, SanDisk have mentioned:
Please allow us to inform you that your Nokia N900 does not officially support microSDXC type of cards. We have also tested the specific device and we recommend our microSDHC Ultra 4GB, 8GB, 16GB and 32GB.
The microSDXC Ultra 64GB may have worked in your phone, but we cannot guarantee that the new card will work without any issues.

Please allow us to inform you that for your convenience, SanDisk has launched an online Product Compatibility Tool; this application lists some of our cards recommended for your device and also suggests many compatible cards for a wide range of devices; this way you can make sure, that you purchase the right card for your device.


http://pct1.sandisk.com/NewSearch.aspx

Having said the above we will strongly suggest you to replace your microSDXC Ultra 64GB with two microSDHC Ultra 32GB which are recommended and more suitable for your phone.
I am going for the replacement 64 GB microSDXC since it worked well for 6 months & because I suspect the damage occurred as a result of the huge scale wifi operation.

SanDisks compatibility chart for the N900 lists the 32 GB MicroSDHC as the largest recommended for the N900. I don't know what criteria was used, but I also notice that all their recommended cards for the N900 are MicroSDHC. I believe if I again wreck the replacement 64 GB microSDXC in the N900, I will buy a 64GB microSDHC & try that.

Presently, my old 32 GB microSDHC is back in the N900, & is nearly full!

Again, SanDisk have been very good in the process of warranty claim.
 

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reinob is offline reinob
2013-07-16 , 08:07
Posts: 1,808 | Thanked: 4,272 times | Joined on Feb 2011 @ Germany
#72
Originally Posted by rotoflex View Post
SanDisks compatibility chart for the N900 lists the 32 GB MicroSDHC as the largest recommended for the N900. I don't know what criteria was used, but I also notice that all their recommended cards for the N900 are MicroSDHC. I believe if I again wreck the replacement 64 GB microSDXC in the N900, I will buy a 64GB microSDHC & try that.
The N900 is compatible with (micro)SDHC, which has a limit of 32GB. That's why they recommend 32GB, because there are no SDHC cards with 64GB.
 

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sixwheeledbeast is offline sixwheeledbeast
2013-07-16 , 08:20
Posts: 2,290 | Thanked: 4,134 times | Joined on Apr 2010 @ UK
#73
Originally Posted by reinob View Post
The N900 is compatible with (micro)SDHC, which has a limit of 32GB. That's why they recommend 32GB, because there are no SDHC cards with 64GB.
Exactly.
This is how it is worded here.
http://wiki.maemo.org/N900_Accessories#Memory_Cards
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misterc is offline misterc
2013-07-16 , 10:16
Posts: 1,625 | Thanked: 998 times | Joined on Aug 2010
#74
especially if logged in with ssh (or on the N900 itself, in a X terminal otherwise) you may want to issue a
Code:
sync
every now and then
forces to write all the data physically
there are no caches on µSD devices, but you never know where the OS may choose to keep data "on a temporary basis"
(been using a 64GB UHS-1 SanDISK since end of last a year on the N900 w/out problem)
EDIT: corrected duration
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Last edited by misterc; 2013-07-16 at 10:19.
 

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rotoflex is offline rotoflex
2013-07-16 , 23:03
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#75
Originally Posted by reinob View Post
The N900 is compatible with (micro)SDHC, which has a limit of 32GB. That's why they recommend 32GB, because there are no SDHC cards with 64GB.
Thank you. I'd seen some 64 GB SDHC cards listed at NewEgg, but apparently an error was made in the listing. Assuming the photos are of the actual product, the writing shows that they're actually SDXC.

http://www.newegg.com/Product/Produc...82E16820211767
http://www.newegg.com/Product/Produc...9SIA12K0948061
http://www.newegg.com/Product/Produc...9SIA1K60P57809
http://www.newegg.com/Product/Produc...9SIA12K0RW9164

The point I'm getting is that the SDHC spec only goes to 32 GB?

In the meantime, the communication with SanDisk is resolved, reasonable, & I think it could not have gone better.
We can proceed in providing a microSDXC Ultra 64GB card as a replacement, however please not, that since the card is not supported by the specific phone, if the card has issues again we won’t be able to replace it again for you since you will be using it to a non-compatible device.

We remain at your service should you require additional information.
Last edited by rotoflex; 2013-07-16 at 23:05.
 

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nman is offline nman
2013-07-17 , 02:32
Posts: 124 | Thanked: 105 times | Joined on Jul 2010
#76
Originally Posted by freemangordon View Post
I am using the Samsung one from here http://forum.xda-developers.com/show....php?t=2047569 for the last couple of months, it has an unbelievable random iops, IMO this is the best card so far to be used in mobile device.
X2, just got this card and it flies. Especially noticeable with easy debian and swap on sd.
I wouldn't recommend the sandisk 64gb cards at this point, the samsung is so much faster.
 

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taxaza is offline taxaza
2014-02-07 , 11:19
Posts: 32 | Thanked: 12 times | Joined on Jan 2010
#77
I bought a SanDisk 32GB class 4. It was constantly going into read only mode due to errors and also the phone was rebooting because I had swap on it too. I think it couldn't keep up with the high demand of IO.
I then bought an Adata Ultra 32GB Class 10/ UHS-1 and it works great. Super fast and reliable:
http://www.ebay.co.uk/itm/Adata-Ultr...item4ac781e2b0

Nice comparison of many cards here:
http://us.hardware.info/reviews/4544...s-a-difference
Last edited by taxaza; 2014-02-07 at 11:34.
 

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FlashInTheNight86 is offline FlashInTheNight86
2014-03-23 , 17:52
Posts: 138 | Thanked: 185 times | Joined on Feb 2014
#78
Has anyone tried putting 128GB card (either microSD either SD with contacts soldered to a dummy microSD) inside N900?
 
sixwheeledbeast is offline sixwheeledbeast
2014-03-23 , 22:43
Posts: 2,290 | Thanked: 4,134 times | Joined on Apr 2010 @ UK
#79
Originally Posted by FlashInTheNight86 View Post
Has anyone tried putting 128GB card (either microSD either SD with contacts soldered to a dummy microSD) inside N900?
If SDXC cards like the 64GB work then I see no reason why it will not work.
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shady is offline shady
2014-03-31 , 13:39
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#80
128GB uSDXC works like a charm... just format it when you put it in, the N900 throws a few errors up but once formatted its AOK.

got mine for $100.
 

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