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Hi,
I have an EFI-partition on my hdd which drastically improves my bios-boot time. But I wanna take a closer look at it and what it does. Because I don't wanna mess this EFI-Partition I wanna work with a copy.
So I created an image with:
dd if=/dev/sdXX of=my_image.img
But how can I mount it now? I loaded the loop-module and tried an:
mount my_image.img /my/mountpoint -o loop
But he wants to know the fs-type. But he doesn't understand what efi is and always tells me it's and unknown filetype if I try:
-t efi
So is it not possible to mount and efi-image under linux? I would really like to take a look at it.
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since you made an image of it, wouldn't the fs-type technically be iso9660?
-t iso9660
Just a thought, so I could be absolutely incorrect.
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Extensible Firmware Interface - Wikipedia:
The EFI specification does not include a description for a file system; implementations of EFI typically support FAT32 as their file system.
Try '-t msdos' (-t auto did not work?).
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@EnvoyRising: No that's just for cd-isos.
@jakobm:
$ sudo mount my_image.img /my/mountpoint
mount: my_image.img is not a block device (maybe try `-o loop'?)
$ sudo mount my_image.img /my/mountpoint -o loop
mount: you must specify the filesystem type
$ sudo mount my_image.img /my/mountpoint -o loop -t auto
mount: you must specify the filesystem type
$ sudo mount my_image.img /my/mountpoint -o loop -t msdos
mount: wrong fs type, bad option, bad superblock on /dev/loop0,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
The same with every fs-type (like vfat..) I tried. So no matter what I try it seems not to work.
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You could try to determine the filesystem the original block device contains with 'blkid'. Be aware that you cannot use this on a loop device/image file.
blkid - command-line utility to locate/print block device attributes
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blkid gives no information about the filesystem type. Just fdisk seems to make a (good) guess:
/dev/sda3 19453 19457 40162+ ef EFI (FAT-12/16/32)
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Jep, when i had a macbook I could mount it as fat32. (directly, not as loopback). Are you sure your image is correct?
< Daenyth> and he works prolifically
4 8 15 16 23 42
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Yes pretty sure I think. I took the image of the partition several times and each time the md5sum is the same. And the partition is definitivly working and boosting my bios-boot.
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