acer iconia tablet harddrive upgrade possible?



Additional? No. There is no space inside for that.
Replace? Maybe. Which model specifically?

And it is actually an SSD, not a hard drive.

Here are the directions for doing it on an Acer Iconia Tab W500:
http://www.tweaking4all.com/hardware/pc/ssd-upgrade-for-acer-iconia-tab-w500/

Your specific model may differ.

Be sure to read all the Warnings and Notes.