G'day Revhead. I guess that your SL disc probably won't work because maybe something is missing off it. The ISO burns 4,779,571,200 bytes of data which cannot fit on a normal SL disc with only has 4,706,074,624 bytes of space available. Maybe you've got a disc that has slightly more space than usual and can fit the additional 73,496,576 bytes. I know there were 800MB CDs around that could take ~80 mins of music instead of the usual 700 MB which took only ~70 mins but i haven't heard of extended DVDs.
This is the reason no one else has been able to do it, indisputably shown in this image:
In the BD burner there's a SL disc, and it's only the usual 4.7GB [4,706,074,624 bytes] available. Microsoft calls it as 4.38GB and they're technically correct because they're still using the original binary Gigabyte [factor of 1024] but these days that is better called a Gibibyte [GiB] 'cos everybody other than M$ who is measuring drive space including CD/DVD makers uses the decimal form of GB [factor of 1000]:
In the DVD burner we have this Toyota C1 ISO burnt to a Double Layer disc and you can see that it's total size is 4,779,571,200 bytes, or Microsoft's binary 4.45 GB [actually now less confusingly we should call Gibibytes, GiB] or just under 4.8 GB [decimal] so cannot fit on a 'normal' Single Layer 4.7 GB disc which only has 4,706,074,624 bytes available so it's short by 73,496,576 bytes, that's ~73.5 MB decimal, or, in binary measure ~70.1 MiB [Mebibytes].
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Some systems don't support DL discs but all the ones that support DL can also use SL.
Whereis CI and C2 discs don't support cams, but i believe that's because of a firmware limitation of the Denso/DVO Dayton units and isn't a limitation by Whereis.