Hi,
I am using a Real-Time board to run software written with Labview and this run in Linux environment.
I encountered a problem reading a SD card that correspond exactly to this http://digital.ni.com/public.nsf/all...3?OpenDocument . As you see in the solution, they suggest to format the card in format EXT3, but the problem is that I need to be able to write the same car also with Windows and it does not support that format.
Do you have any suggestion? Thank you

It's kind of unclear what you are asking. Based on the link you provided that "corresponds exactly" it seems you're having these issues because of ungraceful (unexpected) loss of power. Are you saying that your sd card is locked in ro and you need help unlocking it?

Hi,

for some reasons, my system will always have an "ungraceful" loss of power. What I need, is to be able to read the SD card every time after the reboot, that is not what is happening now...

Does your os boot from the sdcard?

check /var/log/syslog for mount errors

That is the nature of filesystems when the system is not shutdown in an orderly fashion. ext3 can recover due to it having a journal but FAT does not. If there are any files open or being written to when power is removed then the filesystem can be corrupted. As suggested a filesystem check will usually repair it so that it is read/writable again but that may not be 100% reliable. There could be some data lost.

The simplest fix as suggested is to use ext3. There is extfs from Paragon that you can use to read ext filesystems in Windows but I do not know how well it works.

http://www.linuxjournal.com/content/...-extfs-windows

Thanks michaelk.
I have another doubt: this problem does not happen if instead using the SD card, I use an USB memory. Is there any reason?

How are you mounting the sdcard in Windows? If you are using a usb adapter try another, especially if it's a cheap one. Even better would be a sd/mmc card slot. I have had sdcards that Windows refused to read for whatever reason it decided if it was in a usb adapter but worked just fine in an mmc adapter on the same computer!

The board already has the slot...

Are you booting the system from the USB or just writing data?

What is the card formatted to?

fat, vfat, ntfs?

Try a different format.

Edit: Else try remounting it rw - I think the command is 'mount -o remount rw /path'

Hi, the system is NOT booting from the SD.
The SD card format is FAT32.

you can read ext3 from windows, you need to install the driver. see for example here: https://www.howtoforge.com/access-li...s-from-windows

Dear all, I have an update, doing some tests, i found that extracting the card and inserting it again is enough to make it readable. The problem is that the system is supposed to be used from remote, so extracting the cars is not easily possible. Do you see a way to make it working

who is "they"?

as you already know what you are suggesting is impossible. You already know that Windows only reads Windows.
So what would you suggest one would do in that situation?

Problem-solving 101:

looking at the facts.

One needs to have it so both Systems are able to read data on the same medium.

Windows only reads Windows? yes, no
Linux reads Windows and Linux? yes, no

what format is best suited to accomplish this?

Could be your computer is powering down that socket.

I believe there is a way to re power it, but I can't remember how, you may need to look online for how to do it.