Reading a camcorder DVD disc

I have 2 DVD discs recorded on a Sony Handycam. They are smaller than the usual DVDs and appear to be double sided and says 2.8 Gb. They are DVD-RW Panasonic.

Disc 1 - I can read it on my external Samsung SE-218 drive and copy the video files to my laptop. But I can only get to side A. How can I access side B?

Disc 2 - Although it plays on my domestic DVD player, the Samsung drive can't see the files. It thinks it's a blank disc. What am I missing?

I may not have access to the camcorder on which these were recorded.

Thanks for any help.