How to loop mount a partition in a full disk image

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How to loop mount a partition in a full disk image
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Get the partition layout of the image
sudo fdisk -lu /home/jc/Desktop/MMC/ampd_max2/work/ampd2Full.img
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Disk /home/jc/Desktop/MMC/ampd_max2/work/ampd2Full.img: 8120 MB, 8120172544 bytes
255 heads, 63 sectors/track, 987 cylinders, total 15859712 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot	Start	End	Blocks	Id	System
/home/jc/Desktop/MMC/ampd_max2/work/ampd2Full.img	1   *      193406    15859711     7833153    1  FAT12
/home/jc/Desktop/MMC/ampd_max2/work/ampd2Full.img	2               4      126207       63102   53  OnTrack DM6 Aux3
/home/jc/Desktop/MMC/ampd_max2/work/ampd2Full.img	3          189310      191357        1024    1  FAT12
/home/jc/Desktop/MMC/ampd_max2/work/ampd2Full.img	4          191358      193405        1024    1  FAT12
Partition table entries are not in disk order
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Calculate the offset from the start of the image to the partition start
Sector size * Start = Offset
512 * 193406 = 99023872
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Mount it on /dev/loop0 using the offset
sudo losetup -o 99023872 /dev/loop7 /home/jc/Desktop/MMC/ampd_max2/work/ampd2Full.img
OR
mount -o loop,offset=$((512 * 99023872)) /home/jc/Desktop/MMC/ampd_max2/work/ampd2Full.img /mnt/ampd2_1
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Now the partition resides on /dev/loop0. You can fsck it, mount it etc
sudo fsck -fv /dev/loop7
fsck.msdos
sudo mount /dev/loop7 /mnt/ampd2_1
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Unmount
sudo umount /mnt
sudo losetup -d /dev/loop0
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