Canon Powershot S80 can no longer read 2gb SD after using ..

In reference to the use of a Canon Powershot S80:

Has anyone see a problem of not being able to read or write to a
smaller SD card after using a bigger one? I just bought a 4gb RiData
SD card and used it for a week while on vacation, photos and movie
clips were fine, but when I ran out of room I switched over to the
smaller previous used 2Gb SD (SanDisk) and the camera report "no memory
card".

Thanks in advance for any replies,
Charlie

charlie.eng DeleteThis @gmail.com wrote:
> In reference to the use of a Canon Powershot S80:
>
> Has anyone see a problem of not being able to read or write to a
> smaller SD card after using a bigger one? I just bought a 4gb RiData
> SD card and used it for a week while on vacation, photos and movie
> clips were fine, but when I ran out of room I switched over to the
> smaller previous used 2Gb SD (SanDisk) and the camera report "no memory
> card".
>
> Thanks in advance for any replies,
> Charlie
>

That is a weird one Charlie.
Perhaps it is just coincidence.
Try another SD card to see if it too, cannot be read.
Does the 2GB card work in a card reader?
Bob Williams