HDD Image resets after reboot

[Manio]

Hi,

i have a weird poblem. The HDD image I use with qemu to boot my OS keeps resetting to a unformatted one after I reboot my Ubuntu.
It was created the following way:

• create 100mb file with dd (if=/dev/zero)
• bind to /dev/loop0 with losetup
• create partition table, and a primary ext2 partition with gparted
• install grub on it

Until i reboot the Image works fine. I have tried different harddrives (HDD/SSD), filesystems (ext4/ext2) and copied the file to various places. Every copy got reset too.

I am running a Ubuntu 12.10 32-bit.
Can anyone help me out? Thanks in advance.

[bluemoon]

unbind the loop0 or sync before you reboot.

[Manio]

Thanks for the reply. I found the actual probem now. The way i create the partition table on my HDD image is wrong. This way it didnt save the partition table to the actual file, but was saved only on /dev/loop1, which gets wiped after reboot.