I had alook on the powerquest Site for you to see compatible CD-RW drives. This is what I found: click here .
So, if your CD-RW is faster than 8X, then I think you will be ok.
'High-Density' is just a tech term used for 1.4MB floppies (most common).
There are other floppies like 'Double-density(720KB)' and 'Super-High-density (2.8MB)' but these are not commonly used.