Don't have Gigabit Ethernet on both ends and switches in between? Sounds like you're maxing out 100Mbit.

Even if you had USB, it might only be USB 2.0 which usually maxes out around 30MBps.

It's only about 10-15 hours at 100Mbit speeds so not that bad really.
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Christian
#40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)