Keeping session open later use?

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I need to take about 2 MB of data (6 jpegs) with me on a CD-R.  I
will use my old Nero v5.5 to burn a CD-R.

Seems like a waste of a new CD-R to only store 2 MB.  So I was
thinking I might be able to store the 2 MB on a CD-R and close the
session but not to close the CD-R.  If I have understood that
correctly I think I should be able to store more data on the CD-R

I want another PC to be certain of reading jpegs I burn to the CD-R.  

Is it possible that some PCs made in the last 2 or 3 years can not
read CD-Rs unless the disc is "closed"?

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