Thanks guys for the replies.
I should have said I had CD-R Identifier (a little old but still does the job for CD-r's) which hasn't crashed on my XP system.
I actually found DVDinfo no sooner had I posted this thread :D.
Got a lucky break yesterday when my friend called me about an order we placed together for some Taiyo Yuden CD-r's and DVD-r media. I had ordered 10 x 4 Speed TY DVD-r disks in DVD cases that would cost Â£35. They delivered me 100 4x TY DVD-r's on a spindle but still charged for the original order of 10
Media details from DVDinfo:
Region info N/A not a DVD-VIDEO
Media code/Mfr ID TYG01
Formatted Size Blank
Total Size 4.38GB(4.71GB)
Book Type DVD-R
Media type V2.2 DVD-R
Media Id Code Speed 4.0x 5540KBs
Current Drive Speed 4.0x 5540KBs
Default Rotation Control CLV
Linear Density 0.267um/bit
No of Layers 1
Burnt my first 10 silver top Ritek's at 4x with my Sony DRU 500AX (firmware's used 2.0c/2.0e/2.0f). Ordered 25 4x ZeroDefex (Ritek 4x G04's but with branded top) and burnt 1 disk at 4x but so far the rest burnt at 2x. Just done 1 TY so far and I am back burning at 4x