Thanks for the feedbacks
I installed tinycore by the CorePlus-current to a USB flash. In my extlinux.conf is tce=UUID=... which is set correct.
TinyCore 8.1.1 works very stable and without problems so far at my USB flash (for 5 weeks almost daily in use), except the strange story I recently had with getlocale. I tried to reproduce the problem, but all worked correct. Must have been a mistake by me or maybe done by one of the daily updates at my other Linux at the harddisk.
concerning hd mounting:
Rich, you're right, I also expect no access at the hd when not mounted. However I didn't mount the harddisk manually when I got this mysterious "language changed" message at the other linux which is installed at the hd.
By the way, is it possible at tinycore that a script/program can mount the harddisk (any sda partition) and make modifications there without my permisson?
best regards
Frank