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cannot change partition ID after repair startup from install disk


I have an Acer laptop which is partitioned with a 1st part OEM (hidden and
not active, partiton type ID 27) the second partition is the OS (partition
type ID 07). I had a problem with the OEM partiton so I had to get ride of
it. after that I was unable to restart Vista (boot manager missing) so I used
the repair otions to recreate the boot manager. I was then able to restart
Vista but with strange behaviors:

the system partiton was set to be of type 27 (hidden + not active) in
diskpart. in disk manager, I simply cannot see a C drive as the partiton is
declared as OEM. I cannot perform any action like other partiton. the
hibernation doens't work anymore.

I said ok, lets try to change the partiton type ID with diskpart.

I ran the following:




after the command I made a detail partiton and noticed that the partiton
type was set to 07.

then in the disk manager I was able to see the C drive and perform any
action (shrink, extend, etc...) I said great I will reboot to see if
everything is fine. the laptop reboots and when I go back to diskpart, the
partiton ID is set back to 27.

I even tried to set it with a partiton tool used from a boot disk, the same
thing happens, the partiton is sat back to 27.

can someone help me on this one, I'm loosing my mind with this thing.

many thanks


My Computer

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