Permissions on Android AT200 removable SD card set to read only

Recently the removale SD card on my at200 has been set to read only for all but a few applications. This mean that when editing or trying to save, copy docs on the SD card I get the "not enough permissions" message. Any editing by these applications requires shifting files to onboard SD card and back again.
Toshiba file manager is able to rw OK, but my other file manager fails, as does ezy PDF.
Reading the attributes of the SD card show that it is set to rw for data.p (permissions XML). But looking at info from file manager shows sdcard directories and files set to dr- or -r-.
Is there some way of getting this changed to allow access for all my installed apps? Or even some?
Cheers
rabel

MisterX,
Found this note from zc2 on the xda forum dealing with the same issue December 2011.
"The owners of Honeycomb-powered tablets experience a problem writing to the external SD card, because since v3.2 the permissions for the files there were changed from sdcard_rw to media_rw.
According the file /system/etc/permissions/platform.xml, any application with declared permission "android.permission.WRITE_MEDIA_STORAGE" should be included to that media_rw group.
But that won't happen.
I made a test application to show the group membership (it just executes the "id" command), and according to its output, the application is not member of the media_rw group, despite the "android.permission.WRITE_MEDIA_STORAGE" permission is mentioned in its manifest.xml"
This is somewhat confirmed by a comment returned to me from the AntTek File Explorer developers on an interum work around for this problem (a common one since 3.2)
"While waiting, the simple solution, if your device is rooted, is as follows:
1. Using AntTek File Explorer, active Native mode from application preference.
2. Navigate to /system/etc/permissions.
3. Open platform.xml and find the WRITE_EXTERNAL_STORAGE permission.
4. Add an additional group definition for this permission: <group gid="media_rw" />. It will grant AntTek Explorer (and other applications) permission to writing to removable SD Card. After edited, it will look like:
<permission name="android.permission.WRITE_EXTERNAL_STORAGE">
<group gid="sdcard_rw" />
<group gid="media_rw" />
</permission>
5. Save the changes to the file.
6. Restart your tablet."
My tablet is not rooted so this was not available to me, but it appears this is a major issue for Honeycomb, including the version on the AT200. Is there any plans to fix this bug do you think? Or is there a date for the promised update to ICS for the AT200, another prime selling point.
Cheers

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Divya - I have done it in the past following these documents. Please read it and try it it will work.
Please read it in the following order since both are a continuation documents for the same purpose (it also contains how to change colors of row dynamically but I didnt do that part I just did the read_only part as your requirement)
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/f0625002-596c-2b10-46af-91cb31b71393
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/d0155eb5-b6ce-2b10-3195-d9704982d69b?quicklink=index&overridelayout=true
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regards
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drw------- 3 root admin hidden 102 Dec 31 20:43 .Spotlight-V100
drwxrwxrwt@ 3 cpstaley admin hidden 102 Jan 3 20:22 .TemporaryItems
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d-wx-wx-wt 2 root admin hidden 68 Jun 5 16:46 .Trashes
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com.apple.FinderInfo 32
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com.apple.FinderInfo 32
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