Unable use disk on ket (removable drive)

[Anthoni]

Dear All,
I got new 8GB flash drive and used it for 2 days, while coping files
to the flash, i got an error message that it can't be copied and since
then I can't use the device.
Deatis:
1) I'm using XP SP2
2) When I try to copy to the disk I get the "Data error (cyclic
redundancy check)" error message (task fail)
3) When i try to delete file I get again the "Data error (cyclic
redundancy check)." error message (task fail)
4) When I try to copy from flash to HD - Succedd!
5) When I try to format the flash -> I get the error message (with or
without the quick format option: "Windows was unable to complete the
format."

I tried to format with DOS but, it did nothing.
Please Help,
What can i do?