Have you looked at the disk with, say, Mpegstreamclip or similar?  That will 
show if it really is blank.  
Severin Crisp

Sent from Sev's iPad

> On 24 Oct 2014, at 2:22 pm, David Noel <lis...@aoi.com.au> wrote:
> 
> I am wondering if anyone can give me a suggestion as to why burning a
> DVD with Toast sometime gives me a blank disc.
> 
> I'm using both Toast 8 and Toast 10, and burning a disc image created
> previously by Toast. The burn appears to go normally, and Toast 10
> even says "Disc XXX burned successfully", but on inserting the disc
> into a reader (OS X 10.6.8, 2 GHz Intel Core Duo iMac), the system
> says "You have inserted a blank disc".
> 
> I actually have 2 disc burners, the internal one (now not always
> reliable), and an external Samsung one which I use routinely. I have
> wondered if the system gets confused which drive it is writing to,
> though I do check the "Recorder Settings" carefully.
> 
> The problem happens quite a lot, but not always, sometimes the burn
> goes straightforwardly. Any ideas?
> 
> David Noel
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