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NAND Flash chip is soldered to the motherboard
Unfortunately, not. The NAND Flash chip used for storage is soldered to the motherboard, see the following photo: http://www.techrepublic.com/photos/cracking-open-the-acer-iconia-tab-a500/6279615?seq=63

The Toshiba Thrive is the only tablet I can think of off hand that has a removable storage chip and PCB. As I noted in my Thrive teardown analysis (http://www.techrepublic.com/blog/itdojo/toshiba-thrive-teardown-most-laptop-like-android-tablet/2775), I assume this let's Toshiba use the same motherboard for all Thrive models.

You can however, use a microSD card with the Iconia Tab for more storage.
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Updated - 17th Aug 2011