Wierd Problem with burning dvd

hi,

I have a really wierd problem with burning dvds, im using sony DW-Q58A, and i am using Ashampoo Burning Studio 7

sometimes when i burn a dvd the program tells me that its burnt succsusfully , and when i try to copy it to the hdd i found somefiles corrupt, and when i try to burn the dvd again the same thing happens unless i move the files to another partition of the hdd, the wierd thing is i cant find any error with my hdd, and the files are copied easily from one partition to another or even over a wireless network

i really need ur help cause this thing is driving me crazy and i am burning alot of dvds ,

by the way i am using sony dvds or Benq(daxon) and both have givin me good quality over the past time