That's a couple of good sources there that pcpunk posted.
Today, for the most part, all CD/DVD RW (read & write) optical drives can "see" most all types of this media, even read & boot from CD/DVD RW media. However some apps cannot use rewriteable media, while others can. One reason may be to protect again the piggybacking of malware, which can write itself onto the RW media & be distributed to most any Windows computer it's inserted in.
I can understand why the Recovery Media creation software would reject the RW type of media.
Evidently, it's also used less frequently, used to be most everywhere, now it's hard to find & expensive where it can be.
Whereas one can find 50 packs of DVD-R media for less than $8 on promo. Same with CD-R, but at the same price, why bother? The CD-R, which holds a max of 700MB, holds only 15% of what a DVD-R will hold. At the same price, one whom has an optical drive that can only read & write to CD's benefits & given the low prices of optical drives today, would be better served to upgrade to a CD/DVD RW optical drive to take advantage of the extra capacity.
I know that a few years back, DVD+R was popular & many computers had the type of optical drives for that media. However, Windows 7 brought a lot of change along with it, that's when I began to notice some retailers were marking down the +R media like crazy (which is why I bought a 100 pack). These were only $10 for the Sony brand, the -R's of the 100 count was like $25 (& of a lesser quality brand, JVC), sitting on the same table. My optical drive could use either, so grabbed what was on promo & that was that. If I were to run across the same deal today, would do the same.
Thanks to pcpunk for the sources above for the benefit of the community.