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USB Flash File Overwrite protection

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I need a utlity that allows writing of new files to a USB flash drive, but prevents modification/deletion of files once they are written to that drive. Basically, I have sequential files that I am backing up, each backup generates a new unique file name, and I am transferring these files to the flash drive.

Here is the sequence of use:
1. The flash drive is inserted into the computer
2. The backup file is generated and copied into the protected folder in the flash drive
3. The folder or the file itself is automatically password protected so that:
a. "normal" user can read the file
b. new files can be added to the folder
c. "normal" user cannot modify or delete files existing in that folder.
d. "super" user can use password to modify/delete files.

Any ideas?
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