Not able to write on Sdcard in emulator

Getting error when trying to push file on sdcard in emulator or not able to write file on sdcard in emulator

Failed to push selection: Read-only file system

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C:\Documents and Settings\<adminstrator>\.android\avd

OR

C:\Documents and Settings\Pankaj\.android\avd

==>

take 'properties' of your avd folder (there is a folder for each of the avd’s)

uncheck 'Read only' -> OK