Any one know anything about dash cam footage ? I recently bought a cheap dash cam using a 32gb memory card the problem i have is that when i try to download footage on to my lap top it will download 6 or 7 of the files but then freezes and says files are corrupt !! Duff camera of Sd card ??

Swap the SD card. That should define which of the two is at fault.

Quite a few Chinese dashcams you have to format the SD card in the dashcam itself, it still works fine with a PC.

The other problem you may have is that it is a "hooky" SD card, something like a 2GB card that pretends to be a 32GB, there's a lot of scams like that, sometimes they even seem to format ok and report free space back ok but they will never store the full amount correctly. I stuff a load of pictures on them then check that windows manages to create the thumbnails for all the files which is quick and easy check. I've had my money back on a fair number of pen drives but been lucky on SD cards.

I wrote that tempting fate. Just tested a 32Gb SD card that came from ebay today, gets to 8GB and stops - its a hooky one.

I have learnt my lesson now . No more cheap Chinese stuff from ebay. The properties show 32gb but can only store around 2gb !! Thanks people !