先用fdisk来查看一下该镜像的分区：
fdisk -l -u ./share/chromiumos-20091211-usb.img
然后会如下列表：
You must set cylinders.
You can do this from the extra functions menu.
Disk share/chromiumos-20091211-usb.img: 0 MB, 0 bytes
255 heads, 63 sectors/track, 0 cylinders, total 0 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
share/chromiumos-20091211-usb.img1 1 50000 25000 83 Linux
Partition 1 has different physical/logical endings:
phys=(24, 26, 17) logical=(3, 28, 42)
Partition 1 does not end on cylinder boundary.
share/chromiumos-20091211-usb.img2 50001 100000 25000 82 Linux swap / Solaris
Partition 2 has different physical/logical beginnings (non-Linux?):
phys=(24, 26, 18) logical=(3, 28, 43)
Partition 2 has different physical/logical endings:
phys=(48, 53, 1) logical=(6, 57, 20)
Partition 2 does not end on cylinder boundary.
share/chromiumos-20091211-usb.img3 * 100001 960160 430080 83 Linux
Partition 3 has different physical/logical beginnings (non-Linux?):
phys=(48, 53, 2) logical=(6, 57, 21)
Partition 3 has different physical/logical endings:
phys=(468, 53, 1) logical=(59, 195, 41)
Partition 3 does not end on cylinder boundary.
上面的例子，是查看的chromiumos-20091211-usb.img，可以看到需要挂载的第三个分区起始位置为：100001，然后可以这样挂载该分区：
mount -o loop,offset=$((100001*512)) ./share/chromiumos-20091211-usb.img ./point
其中1000001*512是指起始扇区乘以字节数。
如此可以在windows下用colinux写入chromeos的文件到本地物理硬盘，然后由grub启动，方便很多，无需使用u盘。
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