Upload to Usb-Storage is very fast, that's why i can't umount!

Hi everyon
If i upload some stuff to an usb-storage it's like its uploading very very fast, like 100mb in 1 second, but in background it's still uploading(i can't umount). The problem is every program is showing me that the stuff is uploaded in 1-2 second. I have to wait everytime, but i don't know how long, and that's really annoying.
How can i fix it ?
/etc/fstab
/dev/sdb /media/sdb vfat rw,users,umask=000,uid=fatih 0 0
dmesg
usb 1-1: USB disconnect, address 4
usb 1-1: new full speed USB device using uhci_hcd and address 5
usb 1-1: configuration #1 chosen from 1 choice
scsi5 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 5
usb-storage: waiting for device to settle before scanning
scsi 5:0:0:0: Direct-Access Nokia N95 1.0 PQ: 0 ANSI: 0
sd 5:0:0:0: [sdb] 1000215 512-byte hardware sectors (512 MB)
sd 5:0:0:0: [sdb] Write Protect is off
sd 5:0:0:0: [sdb] Mode Sense: 03 00 00 00
sd 5:0:0:0: [sdb] Assuming drive cache: write through
sd 5:0:0:0: [sdb] 1000215 512-byte hardware sectors (512 MB)
sd 5:0:0:0: [sdb] Write Protect is off
sd 5:0:0:0: [sdb] Mode Sense: 03 00 00 00
sd 5:0:0:0: [sdb] Assuming drive cache: write through
sdb: unknown partition table
sd 5:0:0:0: [sdb] Attached SCSI removable disk
sd 5:0:0:0: Attached scsi generic sg2 type 0
usb-storage: device scan complete
usb 1-1: USB disconnect, address 5
NOTE: I've tried it on Ubuntu, and there wasn't any problem.

But i don't know how long i have to wait.
Well, thats kind of the thing... It could be forever. The kernel/filesystem might decide to halt copying until you decide to sync _or_ add more files, so it can make all the pieces in the puzzle (partition) fit without defragmentation. See?
If you decide to mount with sync, you get a steady stream transfer to your device, and you will theoretically see how long the task will take. (am i mistaken?)
If you decide to go with nosync (default behaviour), this is not possible. But the benefit would be less defragmentation.
I guess that i would be possible to have the system tell you how long the actual "sync" manouver will take when you unmount, but as far as i know this is not implemented yet. Maybe you could file a feature request somewhere? (i dont know if the HAL scripts or notification-daemon is reponsible for the actual "information" you recieve)

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