Problems transferring large files to SDHC

[cenatix]

I've got a 8gb class 6 SDHC formatted to fat32. I am trying to transfer my Garmin maps to the card but I am receiving an error "Cannot copy [FILE]...I/O Error".

I don't have a card reader that reads high capacity cards. I have been using ActiveSync and "Connect to PC via Disk Drive" feature with no success. I have formatted the card three times but I still receive the error when transferring large files (ie 400mb). I can transfer 10mb files fine.

I'm thinking I may need to get a SDHC card reader but I'd like to get your opinions first.