[OS X TeX] backing up /usr (and MacTeX)
Joseph C. Slater PE, PhD
joseph.slater at wright.edu
Fri Jan 30 13:03:06 EST 2009
On Jan 30, 2009, at 12:53 PM, George Gratzer wrote:
> 1. I bought Intego Backup, and through it away. Replaced it with
> Data Backup from Prosoft, very good. If you buy the backup book from
> Tidbit, you get Data Backup half price.
> 2. Compare FireWire 800 and USB 2.0, and you will realize why Apple
> is no longer interested. Most new movie cameras use USB 2.0. And USB
> 3.0 is so much more powerful, coming soon.
I did, and still don't understand. From wikipedia:
"Although high-speed USB 2.0 nominally runs at a higher signaling rate
(480 Mbit/s) than FireWire 400, data transfers over S400 FireWire
interfaces generally outperform similar transfers over USB 2.0
interfaces. Typical USB PC-hosts rarely exceed sustained transfers of
280 Mbit/s, with 240 Mbit/s being more typical. This is likely due to
USB's reliance on the host-processor to manage low-level USB protocol,
whereas FireWire delegates the same tasks to the interface hardware.
For example, the FireWire host interface supports memory-mapped
devices, which allows high-level protocols to run without loading the
host CPU with interrupts and buffer-copy operations. Besides
throughput, other differences are that it uses simpler bus networking,
provides more power over the chain, more reliable data transfer, and
uses less CPU resources.
FireWire 800 is substantially faster than Hi-Speed USB, both in theory
and in practice."
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