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The sdcard can be umounted by using the umount command.

unmount /mtn/sdcard/.android_secure

how can it be remounted again . I tried using the mount command

mount /mnt/sdcard/.android_secure
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Connect your device and at the command prompt:

Type adb devices & press enter (Your device should now be listed)...

Type adb shell & press enter (Wait for the "#" to appear)....

Type mount sdcard next to the "#" sign & press enter...

You will need to know the mount point also if you intend to mount the external card.

As an example:

su mount -o bind /mnt/emmc /sdcard/external_sd

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I face sh: unmount: not found , I have transformer tf 101 – forsubhi Feb 21 '13 at 16:03
Bit of a delayed comment, but in unix environments it's "umount" not "unmount". How did they not see this would confuse so many people I do not know. – Geesh_SO May 5 '13 at 19:26
@forsubhi, as Gessh_SO said, "umount", not "unmount". – Prof. Falken May 20 '13 at 16:31

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