I got problem when I'm installing Back track 4.0 final from USB. It's happened when copying files process from USB. and the error log is like here :

from syslog file:
Code:
Apr 26 20:19:14 bt kernel: usb-storage: device scan complete
Apr 26 20:19:14 bt kernel: sd 4:0:0:0: [sdb] Assuming drive cache: write through
Apr 26 20:19:14 bt kernel:  sdb: sdb1
Apr 26 20:19:14 bt kernel: sd 4:0:0:0: [sdb] Attached SCSI removable disk
Apr 26 20:19:48 bt kernel: [drm:i915_get_vblank_counter] *ERROR* trying to get vblank count for disabled pipe 0
Anyone can help to solve my problem? Thanks for the administrator for your permission to let my message put here.