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[Vi10 Ultimate] Micro SD card woes

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Nikojiro|Post time:4-16-2016 18:05:54 View:3425|Reply:21

Edited by Nikojiro at 4-12-2016 13:16

Hi,

I have a Vi10 Ultimate, serial Vi10 U64G22151101159.

It is able to read FAT32 micro SDs under 32 Gb capacity without issues. However a 64Gb or 128Gb fails to mount at startup. I have to eject then insert again the card to have it mounted and showing up in Windows. And it will randomly unmount itself, for instance watching video stored on the SD it will unmount itself after 1-2 minutes or 5 minutes.

Driver manager shows an error 10 code. I've tried fully resetting Windows, flashing the BIOS, to no avail ... Oh and of course the driver is a generic SD storage driver by Microsoft so it's already updated to the latest version.

Really annoying, as my old 32Gb dual boot Vi10 has no such issue (I usea FAT32 128Gb card shared between Win10 and Android with it).

Help would be extremely welcome.
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RavenSpy| Post time 4-13-2016 12:08:11 | Show all posts
Same happens to me. I try diferent cards from 64GB to 16GB, and only works the 16GB for me.
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Nikojiro| Post time 4-14-2016 02:47:26 | Show all posts
Edited by Nikojiro at 4-14-2016 02:50

It seems to be a driver issue, as I can read 64Gb and 128Gb cards, but it is very unstable, and never manages to mount at Windows startup... Whenever the card unmounts itself, driver manager reports an error code 10 on the SD controller. The driver is sdstor.inf, a generic driver provided by Microsoft, and it's updated to the latest version. I suspect that a custom driver should be used instead.

I currently use a 32Gb class 10 card, it works. But I'd really like to get 128Gb working.
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Benjamin78| Post time 4-14-2016 06:46:19 | Show all posts

error 10

Edited by Benjamin78 at 4-14-2016 07:01

Hi i am using vi10 ultimate 64gb window10 verison . able to read 64gb but not 128gb in all formats ( sdhc ,sdxc )
but my seller posted that it could read max 128gb .
Hope a update can solve the issue soon
error 10 a.jpg
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Nikojiro| Post time 4-15-2016 00:17:51 | Show all posts
Exact same problem, thanks for the screenshot.
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RavenSpy| Post time 4-15-2016 00:59:00 | Show all posts
Yes, same happens to my. Let's wait for a chuwi response for this problem...
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Benjamin78| Post time 4-15-2016 03:37:12 | Show all posts
let's hope there will be a new update from chuwi
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Nikojiro| Post time 4-15-2016 04:46:51 | Show all posts
Hmm I may have a lead to what's causing trouble. I juste recived a brand new 128Gb class 10 micro SD, put it in the tab, and it works. Mounts properly at Windows startup, and gives me abouit 10-15 Mb/s write speeds. It's formatted in exFat.

I've reformatted myself several times the two other cards I tried (64Gb and 128Gb). Both 128Gb are the same brand and model (LD, and Shenzhen based manufacturer, they use Samsung modules).

So I suspect that the driver is picky about how the partitioning is done. My initial investigation shows that all 3 cards have a unformatted 16Mb space at the beginning, so my number one suspect is the cluster size that was used. I'll have a look with PartedMagic Live USB when I get some time, and will post to keep you guys informed.
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RavenSpy| Post time 4-15-2016 10:16:00 | Show all posts
Edited by RavenSpy at 4-15-2016 19:18

Some info, maybe usefull:

Tested cards:
Transcend x300 32GB: doesn't works
Transcend x400 64GB: doesn't works
LD (China brand i think) 64GB: doesn't works
Unbranded card 16GB: works good, devices shown as "Generic NCard SD Card"

I test NTFS, FAT32 and exFat systems and all fails.
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Benjamin78| Post time 4-16-2016 18:05:54 | Show all posts
Hi guys , sounds good.
I tested with
Sandisk 128GB sdxc class 10   - Fail to read
Remax 128GB sdhc  class 10   - Fail to read
Samsung 64GB sdxc class 10   - can read   

tested with all formats with those unable to read card  
fyi
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