Block device image files are just a large contiguous set of blocks for the device they are emulating. I realize that file extensions are more for the user and that generally on Linux operating systems are not required.

I am curious if there is a standard extension, example .img as in lun1.img, used as a file based block device to be served as an iscsi target

1 Answer 1


I'm not aware of any de jure standard, but as far as de facto standards go, I think .img is as close as one exists. However, as you note, they're unnecessary on Linux, so don't get too worked up about it.

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