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slow transfer off main hard drive

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linux-howto

http://www.linuxforums.org – I have a 500 gig external usb, and a few 8 gig flash drives. If i copy a file (say a movie or large file) from my primary hard drive (80 gig WD formatted to ext3) to a usb drive it transfers very slowly, about 2 mb/s. But if I copy a file off my secondary internal drive (40 gig seagate formatted to ntfs) it transfers full speed (25-30 mb/s) Its also very slow transfering between internal hard drives (again, no more than 5 mb/s) I checked and as far as i can tell both drives are running in DMA mode. Any reason my primary seems to be causing this bottleneck? it seems to preform fine otherwise (as it is the drive with my ubuntu installation on it) thanks (HowTos)