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I have an Android phone running Android 2.2.1 with very limited phone memory. So I have to move the applications to SD card all the time.

BUT:

If I move applications to the SD card, then after I reboot the phone, some of the (most likely the bigger in size ones) will disappear on the application panel. And the icons in the settings → application management will turn into a gray icon with a SD mark on it. Also the name becomes the package name like 'com.foo.bar'. If I tap the icon, only the remove button is available. This is different from the issue of icons on application panel loads slow after reboot. This issue is about the application just won't load.

Another thing on I noticed is that, on reboot, loading SD card seems done in a very short time. Maybe the system is not loading the SD card with enough time.

Is there anything I can do about it?

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Can you access the SD card afterwards? Are any other files disappearing? Additionally, if (after those apps "disappeared") you take out the sd card and mount it to your computer using a card reader, can you check the .android_secure directory on it whether the .apk files are still there? – Izzy Dec 6 '12 at 13:16
thanks for reply @Izzy photos and files on sd card are accessable as usual. I did as you told, there was a .android_secure folder, but i only saw .ases files, no any .apk files there. – Still.Wang Dec 6 '12 at 13:24
I forgot to mention that they have a different extension there (should be .asec), as they are encrypted. Are all the "missing apps" still there? If so, you've got some problem with the App2SD service. Are you using the native method (as provided by Android itself), or any 3rd-party helper apps? – Izzy Dec 6 '12 at 13:27
What model phone? Are you rooted? Are you using the built-in "move to SD card"? I assume that these applications work fine if they're not on the SD card, yes? – Al Everett Dec 6 '12 at 13:29
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There are many apps that wont run from an SD Card, read some of this article hobbyistsoftware.com/InsideYourTreo/run-app-from-sd-card.php – Simon Dec 6 '12 at 14:27
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