Do ALL android devices have an internal SD card?

Question

On the first run of my app, I am downloading a pretty big file to /sdcard/

I already know this can fail if the internal SD card of the user\'s phone is full or not m

Answer 1

But are there any android devices with NO INTERNAL SD CARD ? (on which my app would definitely be unusable)

Any device that has the Android Market will have at least 2GB of storage at Environment.getExternalStorageDirectory(). Whether that is an SD card or something else will vary by device.