No the cardreader/Sony memstick are used as on Debian (where they work)

Extracting and reinserting the Sony memstick did not help.

The 9GB was priced 118 euros (VAT included) in Pisa. I did not check either the brand or the guaranty for how many writing sessions.

As to my problems above (similar to those with the Ethernet, se accompanying mail on forum), I suffer from lack of clear indications about filesystems into play. I looked on knoppix at /etc/fstab and run df -h, fdisk ..., all largely different from what is seen on Debian. Surely by deepening the matter one might be able to compare, but it takes time, which I lack. It is the common fault of software: a lot of indications on click here and there, and a lack of clear statements at the beginning where the filesystems are and at what purpose.

Cheers
francesco