1) Assume `-' is 1MB and user sets solid block size to be 10MB
2) `*' is solid block desired size, `+' is solid block extension
3) resulting blocks

[q]
1)
 file1   file2         file3 file4
|-------|-------------|-----|--------|
2)
 block1                block2
|**********+++++++++++|**********++++|
3)
 block1                block2
|*********************|**************|
[/q]

It could also utilise mechanism from solid volumes (-sv) where blocks are hard cut, without troubling with file limits.

[q]
1)
 file1   file2         file3 file4
|-------|-------------|-----|--------|
2)
 block1     block2     block3     block4
|**********|**********|**********|***|
[/q]