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Thanks for finding and posting that procedure. Was having that excact problem and after making the edit to permissions I am now able to write to the external sd card. ES file explorer now allows writing to the external sd as well as Titanium Backup.
Interesting note: Titanium was backing up to the internal sd. Once the external became available to write to I was able to create a backup folder there and ran another batch of backups.
From what Ive found you need superuser access to the external sdcard to write to it. I've always been able to access the external sdcard with Titanium Backup as the location of the backup was the first thing I changed in its settings when I installed it. Root Explorer can write to it too. The only programs that can't are the ones without superuser access, ES File Explorer is one I have that I can't get its root explorer working, its not requesting superuser access, so it can't write to the sdcard.
Not sure if this has anything to do with the sdcard mounting to a pc as an MTP device instead of MSC or not but really irritated by that protocol. Not sure if this (MTP) is native to Honeycomb or if Samsung wanted the external storage accessed in this way.
I'm having some trouble with this procedure. Like everyone else, I couldn't write to my external SD card using ES Explorer or what not, although the stock Samsung My Files explorer could (and strangely, if I use a Samba mount I could write to it from my Win7 PC).
Anyway I've rooted everything, and was about to edit platform.xml, but I can't save it. I don't have the ability to write to the system folder.
I think I've done the Mount rw thing, ES File Explorer's option to do it was disabled, but on File Expert it was available. For good measure, I also used the app "mount /system (rw /ro)" but even with all these tools, I still can't write to the system directory.
I'm at my wits end, any ideas?
I can't post a link to the original post on another forum that worked for me so I will quote it:
Simple solution for external sdcard write access on Android 3.2...if you're rooted
I've found a simple solution for gaining write access to the external sdcard (/mnt/sdcard2) on Android 3.2. The sdcard is mounted r/w, but the owning group is media_rw which is linked to the WRITE_MEDIA_STORAGE permission. Unfortunately, this permission was not required for access to the external sdcard prior to 3.2 so most file management utilities do not request it when they run...meaning they only have read access to the card.
The simple solution, if you're rooted, is as follows:
1. Using a root-enabled file manager, navigate to /system/etc/permissions and make sure you have mounted the file system r/w.
2. Edit platform.xml and find the WRITE_EXTERNAL_STORAGE permission.
3. Add an additional group definition for this permission...<group gid="media_rw" />
4. Save the changes to the file.
5. Restart your tablet.
After this change, any apps that request the WRITE_EXTERNAL_STORAGE permission (which includes almost anything that access either of the sdcards) will gain group membership in both sdcard_rw AND media_rw, giving them r/w access to both sdcard filesystems.
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