Was Super Mario Bros. 2 for the FDS a two-sided disk?

I recently bought a Famicom Disk System, and am looking at buying some disks to go along with it. In particular, Mario Bros 1 and 2 (AKA "The Lost Levels").

In one eBay auction I'm looking at, an SMB2 disk the game on one side, and Volleyball on the other. Yet in this Japanese ad, the disk shown at the end has "A" printed on it, which makes me think it's two-sided.

To confuse things further, people in this forum thread speak of the game being both one and two sided (with the one-sided disk having SMB1 on the other side).

So my questions are:

  1. Was SMB2 a two-sided game?
  2. If there was a two-sided version, are there any differences between that one and the one-sided version I'm looking at on eBay)?

Solution 1:

Searching around yielded little to no results to answer your questions. However, after you provided the images of the posting, I was able to translate this image using Google's Image translator app on my phone. Although it's not perfect, every time it seemed to come to the conclusion that the bottom bullet basically says "No software on Side B, new software can be written."

No Side B

Due to what little is available about this, I would believe that this game is only one sided.

Side note: I got some interesting translations, like the red text in the above image saying "Fur Peeler" - I think the red text says "Family Computer Disk System" but the plastic on the game case blurs it somewhat in the image

Edit:

The eBay listing stated that it contains "Super Mario Bros 2 + Volley Ball", so this particular disk seems to have two sides, but for two different games.

eBay Image