BIS and TER REPAETITA...!
Problem almost solved...?
1- Knop7.2 was concerned in place of 7.4.2. But this is not essential.
Always I boot from iso file.
2- FileSystem concerned (and corrected also by GParted):
2a- NTfs..PRESENT. Ah! NTfs...not recommended for current usage b
but occasionnally only. Despite I avoid WRITING.
This is well known
"CHKDSK / f" recommended as always (twice).
Before GParted if possible.
2b- "A 2nd ReiserFS Partition" for knoppix installed on an USB_HDD.
This makes folders rigths access too strong when saving files.
To avoid such my problems it is worthwhile:
---2b1 to save files AND change ALL Rights to the LEAST way...Or
---2b2 to save files first on the associated "Fat Knoppix.img" which
allows AUTOMATICALLY the least RIGTHS. This avoid forgetting
Naturally these methods break some security problem.
But Mr K.KNOPPER doing this automatically on the "knoppix.img" (boot-iso)
I may suppose it is not a great danger....Perhaps Viruses?
Thanks for all eventual remarks and advertisings