With Linux it's straight forward, if you pay attention to a few things - I struggled especially with a bootable image (offset parameter), so I hope it helps:
I. If you have created an image with pcem, you'll find an image file.
1. In terminal type:
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fdisk -l <your.img>
If your image contains multiple partitions, they are all shown with their starting sectors. Note, that extended partitions are just structures for logical partitions, that can't be mounted; only mount partitions, for which fdisk identifies a filesystem.
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fdisk -l hdd2.img
Disk hdd2.img: 42 MiB, 44040192 bytes, 86016 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
Disklabel type: dos
Disk identifier: 0x00000000
Device Boot Start End Sectors Size Id Type
hdd2.img1 17 41054 41038 20M 4 FAT16 <32M
hdd2.img2 41055 87107 46053 22.5M 5 Extended
hdd2.img5 41072 87107 46036 22.5M 4 FAT16 <32M
Note: For me it didn't make a difference, if fdisk -l is invoked without special drive specs (see II.2.). Try it, maybe it makes a difference in some cases like using real disc images.
2. To mount it just type:
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mount -o loop,offset=<start*sectorsize> <your.img> <desired mount point>
3. If it requires root rights to do, just mount as root or check your distributions help, how to mount with user privileges (e.g. add to fstab).
If mounted as root, adding
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-o umask=000, ...
will allow everbody to read and write the image.
Running pcem with a mounted disc doesn't seem to work, so unmount the disc when starting pcem / exit pcem before mounting.
II. You can create an image with linux too.
1. Create an image file
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dd if=/dev/zero of=<your.img> bs=1M count=<desired MB>
Run pcem and check in BIOS, which drives are supported by your "computer". Most BIOS have a lot of predefined disc specs they accept.
E.g. Classical hard disc (nr. 14 in Amibios):
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42 MB, 733 cyclinders, 7 heads, 17 sectors, 512 bytes/sector
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fdisk -C <cylinders> -H <heads> -S <sectors> <your.img>
a. Press "c" for DOS compatibility
b. Press "n" to create a partition
c. Press "t" to change partition type to 6 (FAT16)
d. Press "w" to write changes
You'll have to format filesystem with MSDOS Format, mkdosfs doesn't seem to work for image
4. Add the disc to pcem in settings & BIOS