When I copy a huge amount of files (some GB) to a usb stick it always fails.

I've detected that the problem is caused because it's mounted

/dev/sdc1 on /media/FERNANDO type vfat (rw,nosuid,nodev,relatime,uid=1001,gid=100,fmask=0022,dmask=0077,codepage=cp437,iocharset=iso8859-1,shortname=mixed,showexec,utf8,flush,errors=remount-ro,uhelper=udisks)
and then when there is any writing error it remounts ro and then it stop copying with an error.

I've tried with some usb sticks and with some usb ports and I've got always the same problem.

If I mount it manually:

andromeda:/etc/udev # mount /dev/sdb1 /mnt/pendrive -o uid=fernando

/dev/sdb1 on /mnt/pendrive type vfat (rw,relatime,uid=1001,fmask=0022,dmask=0022,codepage=cp437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)

it seems to work fine. So i would like to change the mount the mount parameters in kde, but i can't find how to do it.

any help?
thank you