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#11
Well then I don't think there is a disk signature collision, else one of them would show as OFFLINE I believe.
Well that's very very curious, and interesting, and promising as to adding new information to this mystery.and i also tried to change the drive letter other than E, that didn't work
What exact steps did you go through when you tried to change the drive letter? Once you enter that dialog, you have to you have to push the CHANGE button, and then select a new drive letter using the dropdown list box choices, and then push OK. So what did you do, and what responses if any did you get convincing you that "it didn't work"?
As far as determining if you actually do have a disk signature issue (which again to me now seems less likely since both disks are shown as ONLINE), get into a DOS command prompt window and perform the following. Note that this is simply to inquire as to the disk signatures of both your drives, not to actually change one or the other. This will tell us if you actually do have a signature collision problem.
(1) Open a command prompt as administrator. To do this in Windows 7, click the Windows start menu (the round Windows icon on the left bottom corner), type "cmd" (without the quotes), right click the "cmd.exe" item that appears at the top of your menu, and click the line "Run as administrator".
(2) Type "diskpart" (without the quotes) into the window. (Note: for this and the other commands described here, you'll have to hit the ENTER key after you finish typing your commands for them to take effect.)
Microsoft DiskPart will start. When it is ready, it will issue a "DISKPART>" prompt, allowing you to enter your commands.
(3) Type "list disk" (without the quotes). This will list all the disks that are currently mounted (connected to the system). The disk will not have the usual names and labels that you're accustomed to from the Windows Explorer interface, so you will have to recognize them by their sizes.
Note that "list disk" actually lists the physical disks, and not the partitions that you may have assigned drive letters. This means that if you have 2 physical disks, with 3 partitions on each, so that you have drives C:, D:, E:, F:, G: and H:, "list disk" will only show "Disk 0" and "Disk 1".
(4) To view the signature of a disk, you must first select it. To select a disk, type "select disk x" (without the quotes) where x is the number of the disk from your "list disk" display. When you type (say) "select disk 1", DiskPart will respond by telling you "Disk 1 is now the selected disk".
(5) Now type "uniqueid disk" (again, without the quotes). DiskPart will respond with the disk's signature, a series of hexadecimal digits.
You can repeat the "select disk x" and "uniqueid disk" commands for the other disk, to see what its signature is.
(6) To quit DiskPart, type "exit". Incidentally, in case you get lost while running DiskPart, when you are at the "DISKPART>" prompt, you can type "help" to get a list of commands. Typing "help" followed by the command typically gives you more info about that command.
(7) Once you've quit DiskPart, type "exit" again to quit the Administrator Command Prompt.