What causes this message when transferring pictures?

I have two Nikon digital cameras: a Coolpix 3100 with a 512 mg Compact Flash Mem. card and a D70 with a 1 GB Com. Flash Mem. card.

After the transfer is complete from the D70 and I attempt to stop the card reader, the computer tells me it's busy and try again later. This is a new development but since it started the other night, has been happening continally.

I have tried the following: Reformatting the card - same message. Using a different card reader-same message.

When transferring pictures from the smaller 512 mb card, this never happens. It is only with the large 1 GB.

My question is, could the mem. card be going bad since I tried two different card readers with same result, or would it be a computer problem?

Try this on another computer. If it happens on that computer also, than it could be a card problem. If not, than it is your computer.

Also sometimes a software upgrade (firmware etc) can help. But try my first suggestion first.

it is probably a p.c problem you probably do not have enough virtual memorie for the 1 gb card

Is your question supposed to make sense ???