I have a CD-RW with 8 cm diammeter and 210 MB capacity. Is this within CD standards? And if so, is its density like 650 MB or 700 MB CD (if it were a 12 cm CD)?

Some remarks that may make my question a bit clearer. Talking about 12 cm CDs, the “normal” capacity is 650 MB. As far as I understand it, there is a tolerance for the distance of two successive tracks. When production got more reliable, it was possible to make the track narrower - close to the inner limits of the standard. This is the 700 MB CD. Later they made CDs with even narrower tracks, resulting in higher capacity, but not conforming to standard. Therefore my question, whether the 8cm/210MB is conforming to standard.

I actually don’t know which diammeter is the inner ring (i. e. where the recording starts, or “time zero”), so I can’t calculate this. I’ve been looking around a bit, but no info.

If anybody knows this, thank you for your reply.

Robert