Surface Pro microSD card unmounts after waking up from sleep

Anonymous

Hi,

I've recently bought Surface Pro along with a 64 GB sd card. I've noticed that after a long sleep period, the SD card unmounts itself and I can no longer find it under explorer. I need to remove and reinsert it before Windows detects the card again. This doesn't happen if I wake up the device shortly after putting it to sleep, only after a few hours. I wouldn't mind it as much if I didn't have to set up Skydrive again after reinserting. I think it might have something to do with s3 sleep, and might be a driver/software error, but I'm not entirely sure. Any ideas?

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Anonymous

I finally solved this problem by enabled write-caching for the SD card. My card no longer unmounts unexpectedly when changing power modes. I realize this comes with some risk of possible data loss if the card is not ejected properly.

I right-clicked on the SD card device in device manager under Disk Drives.
Then clicked properties
Then went to the policies tab
And then selected "best performance"

So far, no unexpected dismounts and no data corruption. This has also improved the performance of the device as reads and writes of large files seem to be much smoother now.

My theory is that this setting is preventing the slot from powering down while in a hibernated or suspended state.

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Anonymous

Hello Ted

Check out my other post here

http://answers.microsoft.com/en-us/surface/forum/surfpro2-surfdevice/micro-sd-slot-no-longer-recognized-in-the-surface/2705d99f-440a-41a4-9bdf-965f1b092efd

Eventually I changed the card same make/ model, formatted it as NTFS and so far have had no issues at all...........and its been almost 2 months now.

I think Scandisk have issues with quality control ?

Try a full format on NTFS , it does take sometime

If it still has issues after that I would use the card in your phone or something else and by another one brand new for the slate.

It worked for me.

I guess we will get the same issues when the 128GB MSD card comes out!

Good luck

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Anonymous

Simply change the driver to generic USB mass storage.

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78 additional answers

Anonymous

2015-02-24T23:26:15+00:00

I will first try using Surface 2 with Type Cover 2 attached but sleep/wake by using power button

then without Type Cover 2 attached

and then segue into the next step - maybe the tape method.

I will report the result.
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Anonymous

2015-02-24T23:12:42+00:00

OK... The example you referred is my reply to AleksKrachanko's post.................................

BTW, my issue seems to be peculiar as my Surface 2 loses Micro SD Card *only* when waken by uncovering the type cover 2. There are some guys have identical problems - http://answers.microsoft.com/en-us/surface/forum/surf2-surfhardware/surface-2-microsd-card-ejects-when-waking/c6d716c9-c1cb-4a93-a0ca-14c2581f5446

So it is! Yes. Have you tried the tape solution yet? I've read reports from others as well of that method doing the trick.

I admit it is curious that you only have the issue on the Surface 2 when you use the cover to open and close. Though I noticed that the original poster on that thread noted: "Seems as I'm the original poster, thought I'd chime back in with an update on this issue especially with regards to the workaround suggested...

...alas the workaround does not work. The SD Card is still intermittently ejected even when using the power button."

I've not owned a Surface 2, but I own and have owned several Surface RT, Surface Pro, Surface Pro 2, and now Surface Pro 3 units. I each case where I've had this issue, swapping out the hardware (per MS Support's suggestion) has indeed solved the issue.

I strongly suspect that there could be a software related component to this issue, insofar as any changes to the retry or timeout values associated with the MicroSD card could make a difference in terms of how the OS responds to a card with an substandard connection. This might explain why in the Surface 2 thread some users reported that the problem began after an update. Or it may be that there are multiple reasons why this problem can occur, or it may even be that sheer randomness made it appear that the problem began after the update, when it would have begun regardless of the update.

-ted
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