Hello Markus,

thanks for your reply. The command line version worked ( sudo mount -o remount,rw /dev/sda1 /mnt/sda1 ) but for some reason when I right clicked on the desktop icon for the drive, chose properties, then went to the device tab and unchecked "read only", it did not have any effect. [ I tried the GUI version of the process before the command line one.]

In any case, it works now, since the command line version was effective. Thanks very much for your help.