guess what...i'm back with pretty good news :
1 - Four hours after my last post, i burnt a ISO live CD of linux (kubuntu 11.04 x86, KDE because very look like Win7 for no-gnome user !)
2 - i boot on the live CD (my fail drive is out and switch of, and no link USB yet)
3 - once linux is full CD-loaded into memory, i run the explorer (its pretty name is Dolphin, no more Konqueror like at my work on my old machine)
4 - i plug the HD on power (i remind you my HD is now a external usb because bring it out quickly of the case since the first failure)
5 - i wait the power look stable (like about 10s to be sure it will not suddenly auto-random switch off itself)
6 - then i connect the usb link to my case
7 - then...miracle...god is an opensource savior !
8 - linux autodetech my usb harddrive quickly (i'm pretty stomached because it did that at least x4 faster than Win7 usb detection and most wonderful of that : no more need to do the dish-mount thing in console with hand, last KDE release does that auto and quickly ! God must really be an opensource melting of strange things)
9 - now i can see the file structure, and begin to browse it, open subfolder (here i got a big fear because once i click on one file, linux try to read it instantly to make a preview thing, or catch details on the install. Why can't it just read the fXXXking mdr & fat to just display the file listing...well more fear that bad thing )
10 - then tadaaaaa, i can copy and paste elsewhere my folder (even ot the need to install ntfs writer, it runs/can wxrite on ntfs at start ! damn, my old-work must be very old....)
11 - i was able to copy/paste my precious data for about 20 minutes then.......the power supply was off again before my entire backup !!! damn it Opensource linux god is not a full savior, just an enticing people!)
12 - i decided to unplug and replug, redo the whole procedure, step by step .... but it won't run anymore ...not bad at all because i successed to backup around 70% of my very important work (most part of the rest was on a old bakcup of 1 month dated)
It could be the end of my story but....no !
13 - i came back under windows
14 - i redo the exact same procedure...
15 - and it ran again !!!!! Yeah !!!! god can be an opensoure thing at all ! it was just a question of time, hazard (principle of heretism, eclipse act...etc..)
16 - quickly i gone on my backup.............then about 5-10min later the hard drive switched off random again.... (i guess satan does exist in all case )
17 - i went to bed and told myself it must be tired like me !
It was really like something was heat, become hot (but no strange small at all, my nose is very good in that).
18 - now, during the morning (7 hours after last success windows boot), the hard drive rans again 20 minutes (same procedure), and i finished my backup.
and the drive shut down again, power supply is sleeping again....
Now, i'm waiting the opening of the IT-shop to quickly buy a new disk because i'm stressing of haveing my whole life on only on support.
Oh, by the way, the hard drive was not placed "à plat" (in french), guess i can translate by "not lay down", but it was stood up and the front connector panel was on the high (to the up).
Last time i checked the random power shutdown, i had notice it had better chances to run when the disk was in stand up position...strange behavior...strange failure for a not-mobile hard drive maybe it depends on the number of heads/platters (four in my case i think)
Thanks for you message and help, and advice.
Even if God is not opensource, it still have improve linux since my last installation at my work ! Glory to Kubuntu (i know people hate KDE, not me..., Joke, kidding..)