Hello, I'm new here, english is not my native language, but I'm gonna do my best.
I need to know in wich zone or byte(s) could I write a few lines (in flash memory) that do not get erase after format the flash.......
I really apreciate any help...thanks in advance
19  2634 
What are you trying to accomplish exactly?
In general, if your program can write to some flash you (or somebody else/the OS) can erase it later.
Also "flash" is a really general concept. What specific "flash" are you dealing with? SD card, thumb drive, etc?
Sorry,, i've not been exact at all...
I have a group of flash memories, not sd, just the common memories that we use to transport information all the time. the problem is that i need to mark this flash and asociate this mark with some password that the user of the flash could has.. I could do this encripting some file and copying it like normal data into the flash memory, but the problem is that it is a common file that any user could see and erase as you said, i need to achieve that in a low level(I guess) that the common user could not see the mark and even could not erase it by normal ways.........
I apreciate you are helping me up......sorry my english
There's nothing that will prevent the formatting of a disk, one way or another. Especially not in C#.
Exactly, so i need to write my little thing in a part of the memory that doesn't erase by formating....do you know what I mean. the thing is to keep whatever i'v writen even after formating...
The question is...when a disk is formated is writen all it's sapace of the partition? or is there any part that is not writen?.....aga in, sorry my english
Rabbit 12,516
Recognized Expert Moderator MVP
There's no way of doing it without creating custom firmware to replace what's on the USB. Much akin to what the U3 platform does on the SanDisk drives.
But i have different types of memories, from diferents manufacturer,st ill could i do this?
Rabbit 12,516
Recognized Expert Moderator MVP
I'm not sure what you mean. You can hack and crack almost anything. But we're talking about custom firmware here, it's not a simple task. We are talking about technical knowledge well beyond a vast majority of the population.
There's always option two, which is fabrication, but if the first option is difficult, option two will be near impossible for most people.
Do yourself a favor and just buy some encrypted flash drives. The work is already done for you.
And there's no way that you can do this with C#, or .NET period. If it is even possible, you're looking at Assembler or C.
To understand what you want and what you can do, you need to know some issues. Like What is Disk Format?
do you think format erase the disk?
No. Not completely. Format create the definition of the storage. i.e. How data will be stored, how they will be read and write, etc..
Do you know what is the format of your flash drive?
I can guess FAT32 or may be NTFS
To protect your specific data........ You better design your own FORMAT. Cause in typical formatting system like FAT, FAT32, NTFS, EXT or other file format they don't protect special memory portion.
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