physical digital weight

Flash drives are self-contained. Therefore, the amount of data is irrelevant. Flash drives have electrons to measure 0 and 1, and it may be noticable (distance affects weight) on a sub-picogram level. I don't believe such a scale exists yet.

Sounds like a Dilbert cartoon.

The pointy-haired boss was complaining that his laptop weighed too much. Dilbert told him to delete some of the files off of it.

Yeah, data doesn't have a physical weight. It's just a set of electro-magentically set data bits, 0 or 1. Like was mentioned before, it might be a VERY small weight difference, but so much, that current weighing methods probably wouldn't even pick up the difference.

Print out hard copies... instant weight gain.

Flash works by storing electrons in key places to remember the values of each bit of data.

The question becomes, in its simplest form.

Does flash move electrons around within the semiconductor substrate, or does it store new ones from the attached power supply?

If the latter case, does logic 1 weigh more or less than logic 0, and, therfore is a flashdrive full of 0xFFFF heavier or lighter than a drive full of 0x0000?

I think that you should move this to the off-topic forum...

But digitxp and Gizmokid2005 are correct.