Can someone tell me what USB/thumb drives use wear leveling. In my case this is problem when I use them for say PVR/set-top-box video recordings. (I've notice

Can someone tell me what USB/thumb drives use wear leveling. In my case this is problem when I use them for say PVR/set-top-box video recordings. (I've noticed my SanDisk USB/thumb drives developing strange errors such as not being able to fast-forward videos at certain points within the recording (viewing crashes). Play the video back at normal speeds and it works OK. If the drive is full and I delete the wayward file then record a new over the same space (which it has to do as that's the only space left on the drive) then the new file acts similarly badly (whereas other files on a different part of the same drive work AOK.) I put this down to the fact that the said drive has no wear leveling. Is this correct?