ok
thanks for ya guidance.
but my drive is ok and other media read very good.
let's me say an example:
you have this disk (cd or dvd).
here is the tree of files and folders.
/doc/manual/xxx_en.pdf
xxx_fr.pdf
xxx_gr.pdf
xxx_it.pdf
...../tip/xxx_en.pdf
xxx_fr.pdf
xxx_gr.pdf
xxx_it.pdf
/install/setup.msi
multi_lang.exe
/support/read_me.html
ok.......
now , when you start copy , copy dialog show the progress of coping.
you see the content of "/doc/manual" are copy first and then "/install" and "/support" are coping.
but at the end you see the copy of "/doc/tip".
why it's happen? the "/tip" folder is subfolder of "/doc" .
they must be copied together.( /manual and /tip )
i think some one can write files and folders as fragmented.
[recovering disk space -- attachment deleted by admin]