Thanks a lot for your extensive tests. Your CD-RW results confirm the standing hypothesis: Recording Speed is always "n/a", but Capacity is reported correctly.
As for your CD-R results, I take it that Recording Speed is always "n/a".
Spurned by your results, I have tested quite a lot of CD-Rs. For all of them, I get "Recording Speed: n/a" and correct Capacity, with a single exception mentioned before. Namely, for TDK d-view 700MB 48x discs
http://www.tdk-europe.com/products/uk/r ... D-R_d-view
(both blank and recorded ones), Nero CD Speed: Disc Info reports
Manufacturer : TDK
Code : 97m15s05f
Disc Type : CD-R
Usage : General
Recording Layer : Dye Type 5: Short Strategy (Phthalocyanine)
Recording Speed : n/a
Capacity : 159:59.74
Additional Capacity : n/a
Overburn Capacity : not tested
whereas SmartBurn 2.1 says
This Disc is designed for CD-RW/COMBO Drive Only.
Disc Type, Material = CD-R, Phthalocyanine
ATIP Lead-in = 97m 15s 05f
Norminal Capacity = 702.83MB (79m 59s 74f)
Disc Manufacturer maybe = TDK M-dye
SMART-BURN Speed Limit = 48X
Since identical SmartBurn results are reported for a different TDK brand (Speed-X instead of d-view) in
http://www.cdrlabs.com/phpBB/viewtopic. ... 1631#51631
I am wondering whether these TDK discs have incorrect ATIPs (in which case neither CD Speed nor my LTR48125W need be fully responsible for the "doubled" Capacity).