[the heanor hard man]

i recently bought some cheap dvd disc's from a market (25 discs for £7) when i go to write onto one of these disc's on clone dvd i'm given the message -
'writing to Video DVD was not successful, Write DVD 5 5'
if u have any ideas on how to overcome this problem please let me know?
*i realise the discs were cheap and from a market and therefore probably won't work*
but any ideas would be appreciated
Thanx